156397680 has 60 divisors (see below), whose sum is σ = 525237960. Its totient is φ = 41705856.

The previous prime is 156397663. The next prime is 156397699. The reversal of 156397680 is 86793651.

It is a happy number.

156397680 is a `hidden beast` number, since 1 + 5 + 639 + 7 + 6 + 8 + 0 = 666.

156397680 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 107890 + ... + 109329.

It is an arithmetic number, because the mean of its divisors is an integer number (8753966).

Almost surely, 2^156397680 is an apocalyptic number.

156397680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156397680 is an abundant number, since it is smaller than the sum of its proper divisors (368840280).

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

156397680 is a wasteful number, since it uses less digits than its factorization.

156397680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217238 (or 217229 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 156397680 is about 12505.9058048588. The cubic root of 156397680 is about 538.7783080967.

The spelling of 156397680 in words is "one hundred fifty-six million, three hundred ninety-seven thousand, six hundred eighty".