133243680 has 96 divisors (see below), whose sum is σ = 424569600. Its totient is φ = 35121152.

The previous prime is 133243679. The next prime is 133243681. The reversal of 133243680 is 86342331.

It is an interprime number because it is at equal distance from previous prime (133243679) and next prime (133243681).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133243681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41161 + ... + 44279.

It is an arithmetic number, because the mean of its divisors is an integer number (4422600).

Almost surely, 2^133243680 is an apocalyptic number.

133243680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133243680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212284800).

133243680 is an abundant number, since it is smaller than the sum of its proper divisors (291325920).

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

133243680 is a wasteful number, since it uses less digits than its factorization.

133243680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3226 (or 3218 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 133243680 is about 11543.1226277814. The cubic root of 133243680 is about 510.7584255971.

The spelling of 133243680 in words is "one hundred thirty-three million, two hundred forty-three thousand, six hundred eighty".