157721056 has 24 divisors (see below), whose sum is σ = 320531904. Its totient is φ = 76316160.

The previous prime is 157721041. The next prime is 157721077. The reversal of 157721056 is 650127751.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78505 + ... + 80488.

It is an arithmetic number, because the mean of its divisors is an integer number (13355496).

Almost surely, 2^157721056 is an apocalyptic number.

157721056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

157721056 is an abundant number, since it is smaller than the sum of its proper divisors (162810848).

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

157721056 is a wasteful number, since it uses less digits than its factorization.

157721056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159034 (or 159026 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 34.

The square root of 157721056 is about 12558.7043917755. The cubic root of 157721056 is about 540.2936856968.

The spelling of 157721056 in words is "one hundred fifty-seven million, seven hundred twenty-one thousand, fifty-six".