157561728 has 32 divisors (see below), whose sum is σ = 418524360. Its totient is φ = 52520448.

The previous prime is 157561711. The next prime is 157561759. The reversal of 157561728 is 827165751.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 157561728.

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, 204775 + ... + 205542.

Almost surely, 2^157561728 is an apocalyptic number.

It is an amenable number.

157561728 is an abundant number, since it is smaller than the sum of its proper divisors (260962632).

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

157561728 is an equidigital number, since it uses as much as digits as its factorization.

157561728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410334 (or 410322 counting only the distinct ones).

The product of its digits is 117600, while the sum is 42.

The square root of 157561728 is about 12552.3594594801. The cubic root of 157561728 is about 540.1116915742. Note that the first 3 decimals are identical.

The spelling of 157561728 in words is "one hundred fifty-seven million, five hundred sixty-one thousand, seven hundred twenty-eight".