157806690 has 32 divisors (see below), whose sum is σ = 391798080. Its totient is φ = 40630464.

The previous prime is 157806679. The next prime is 157806731. The reversal of 157806690 is 96608751.

157806690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×157806690² = 49805902817512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89824 + ... + 91563.

It is an arithmetic number, because the mean of its divisors is an integer number (12243690).

Almost surely, 2^157806690 is an apocalyptic number.

157806690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157806690 is an abundant number, since it is smaller than the sum of its proper divisors (233991390).

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

157806690 is a wasteful number, since it uses less digits than its factorization.

157806690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181426.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 157806690 is about 12562.1132776297. The cubic root of 157806690 is about 540.3914514181.

The spelling of 157806690 in words is "one hundred fifty-seven million, eight hundred six thousand, six hundred ninety".