157215690 has 48 divisors (see below), whose sum is σ = 430279200. Its totient is φ = 39717216.

The previous prime is 157215683. The next prime is 157215703. The reversal of 157215690 is 96512751.

It is a super-2 number, since 2×157215690² = 49433546364352200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44260 + ... + 47679.

It is an arithmetic number, because the mean of its divisors is an integer number (8964150).

Almost surely, 2^157215690 is an apocalyptic number.

157215690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157215690 is an abundant number, since it is smaller than the sum of its proper divisors (273063510).

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

157215690 is a wasteful number, since it uses less digits than its factorization.

157215690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91971 (or 91968 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 157215690 is about 12538.5681000663. The cubic root of 157215690 is about 539.7160029297.

The spelling of 157215690 in words is "one hundred fifty-seven million, two hundred fifteen thousand, six hundred ninety".