156840656 has 80 divisors (see below), whose sum is σ = 361881600. Its totient is φ = 64437120.

The previous prime is 156840653. The next prime is 156840661. The reversal of 156840656 is 656048651.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156840653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690815 + ... + 691041.

It is an arithmetic number, because the mean of its divisors is an integer number (4523520).

Almost surely, 2^156840656 is an apocalyptic number.

156840656 is a gapful number since it is divisible by the number (16) 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 156840656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180940800).

156840656 is an abundant number, since it is smaller than the sum of its proper divisors (205040944).

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

156840656 is a wasteful number, since it uses less digits than its factorization.

156840656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 156840656 is about 12523.6039541340. The cubic root of 156840656 is about 539.2865016619.

It can be divided in two parts, 1568 and 40656, that added together give a palindrome (42224).

The spelling of 156840656 in words is "one hundred fifty-six million, eight hundred forty thousand, six hundred fifty-six".