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133245640 = 23511302831
BaseRepresentation
bin1111111000100…
…10101011001000
3100021201120122201
413330102223020
5233102330030
621115525544
73205366153
oct774225310
9307646581
10133245640
1169239470
12387598b4
13217b3b98
14139a6c9a
15ba702ca
hex7f12ac8

133245640 has 32 divisors (see below), whose sum is σ = 327058560. Its totient is φ = 48452800.

The previous prime is 133245617. The next prime is 133245649. The reversal of 133245640 is 46542331.

133245640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 133245599 and 133245608.

It is not an unprimeable number, because it can be changed into a prime (133245649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150976 + ... + 151855.

It is an arithmetic number, because the mean of its divisors is an integer number (10220580).

Almost surely, 2133245640 is an apocalyptic number.

133245640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133245640 is an abundant number, since it is smaller than the sum of its proper divisors (193812920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133245640 is a wasteful number, since it uses less digits than its factorization.

133245640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302853 (or 302849 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 133245640 is about 11543.2075265067. The cubic root of 133245640 is about 510.7609299850.

Adding to 133245640 its reverse (46542331), we get a palindrome (179787971).

The spelling of 133245640 in words is "one hundred thirty-three million, two hundred forty-five thousand, six hundred forty".

Divisors: 1 2 4 5 8 10 11 20 22 40 44 55 88 110 220 440 302831 605662 1211324 1514155 2422648 3028310 3331141 6056620 6662282 12113240 13324564 16655705 26649128 33311410 66622820 133245640