156122640 has 140 divisors (see below), whose sum is σ = 544432044. Its totient is φ = 41617152.

The previous prime is 156122623. The next prime is 156122641. The reversal of 156122640 is 46221651.

156122640 is a `hidden beast` number, since 1 + 5 + 6 + 12 + 2 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22581504 + 133541136 = 4752^2 + 11556^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (156122641) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 56982 + ... + 59658.

Almost surely, 2^156122640 is an apocalyptic number.

156122640 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 156122640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272216022).

156122640 is an abundant number, since it is smaller than the sum of its proper divisors (388309404).

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

156122640 is an equidigital number, since it uses as much as digits as its factorization.

156122640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708 (or 2687 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 156122640 is about 12494.9045614602. The cubic root of 156122640 is about 538.4622920345.

The spelling of 156122640 in words is "one hundred fifty-six million, one hundred twenty-two thousand, six hundred forty".