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666490 = 25117383
BaseRepresentation
bin10100010101101111010
31020212020211
42202231322
5132311430
622141334
75444056
oct2425572
91225224
10666490
11415820
1228184a
131a4496
14134c66
15d272a
hexa2b7a

666490 has 32 divisors (see below), whose sum is σ = 1342656. Its totient is φ = 236160.

The previous prime is 666467. The next prime is 666493. The reversal of 666490 is 94666.

It is not an unprimeable number, because it can be changed into a prime (666493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7989 + ... + 8071.

It is an arithmetic number, because the mean of its divisors is an integer number (41958).

2666490 is an apocalyptic number.

666490 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

666490 is a wasteful number, since it uses less digits than its factorization.

666490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 666490 is about 816.3883879625. The cubic root of 666490 is about 87.3503291645.

It can be divided in two parts, 666 and 490, that added together give a square (1156 = 342).

The spelling of 666490 in words is "six hundred sixty-six thousand, four hundred ninety".

Divisors: 1 2 5 10 11 22 55 73 83 110 146 166 365 415 730 803 830 913 1606 1826 4015 4565 6059 8030 9130 12118 30295 60590 66649 133298 333245 666490