156813640 has 32 divisors (see below), whose sum is σ = 353331000. Its totient is φ = 62636544.

The previous prime is 156813637. The next prime is 156813677. The reversal of 156813640 is 46318651.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 84529636 + 72284004 = 9194^2 + 8502^2 .

It is a junction number, because it is equal to n+sod(n) for n = 156813596 and 156813605.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 30796 + ... + 35524.

Almost surely, 2^156813640 is an apocalyptic number.

156813640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156813640 is an abundant number, since it is smaller than the sum of its proper divisors (196517360).

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

156813640 is a wasteful number, since it uses less digits than its factorization.

156813640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5569 (or 5565 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 156813640 is about 12522.5253044264. The cubic root of 156813640 is about 539.2555356247.

It can be divided in two parts, 15681 and 3640, that added together give a square (19321 = 139²).

The spelling of 156813640 in words is "one hundred fifty-six million, eight hundred thirteen thousand, six hundred forty".