156640868 has 12 divisors (see below), whose sum is σ = 276123372. Its totient is φ = 77748480.

The previous prime is 156640867. The next prime is 156640871. The reversal of 156640868 is 868046651.

It can be written as a sum of positive squares in 2 ways, for example, as 110292004 + 46348864 = 10502^2 + 6808^2 .

It is not an unprimeable number, because it can be changed into a prime (156640867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142373 + ... + 143468.

It is an arithmetic number, because the mean of its divisors is an integer number (23010281).

Almost surely, 2^156640868 is an apocalyptic number.

It is an amenable number.

156640868 is a deficient number, since it is larger than the sum of its proper divisors (119482504).

156640868 is a wasteful number, since it uses less digits than its factorization.

156640868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285982 (or 285980 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 156640868 is about 12515.6249544320. The cubic root of 156640868 is about 539.0574183034.

The spelling of 156640868 in words is "one hundred fifty-six million, six hundred forty thousand, eight hundred sixty-eight".