156997872 has 80 divisors (see below), whose sum is σ = 459211680. Its totient is φ = 51337728.

The previous prime is 156997861. The next prime is 156997877. The reversal of 156997872 is 278799651.

156997872 is a `hidden beast` number, since 1 + 569 + 9 + 7 + 8 + 72 = 666.

156997872 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156997877) 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, 19468 + ... + 26324.

It is an arithmetic number, because the mean of its divisors is an integer number (5740146).

Almost surely, 2^156997872 is an apocalyptic number.

156997872 is a gapful number since it is divisible by the number (12) 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 156997872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229605840).

156997872 is an abundant number, since it is smaller than the sum of its proper divisors (302213808).

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

156997872 is a wasteful number, since it uses less digits than its factorization.

156997872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6927 (or 6915 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 156997872 is about 12529.8791694094. The cubic root of 156997872 is about 539.4666338535.

The spelling of 156997872 in words is "one hundred fifty-six million, nine hundred ninety-seven thousand, eight hundred seventy-two".