156788640 has 72 divisors (see below), whose sum is σ = 535046148. Its totient is φ = 41809920.

The previous prime is 156788629. The next prime is 156788641. The reversal of 156788640 is 46887651.

It is a happy number.

156788640 is a `hidden beast` number, since 1 + 567 + 8 + 86 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 156650256 + 138384 = 12516^2 + 372^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (156788641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53001 + ... + 55880.

Almost surely, 2^156788640 is an apocalyptic number.

156788640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156788640 is an abundant number, since it is smaller than the sum of its proper divisors (378257508).

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

156788640 is a wasteful number, since it uses less digits than its factorization.

156788640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108902 (or 108891 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 156788640 is about 12521.5270634216. The cubic root of 156788640 is about 539.2268771805.

The spelling of 156788640 in words is "one hundred fifty-six million, seven hundred eighty-eight thousand, six hundred forty".