157693290 has 64 divisors (see below), whose sum is σ = 396576000. Its totient is φ = 40054784.

The previous prime is 157693259. The next prime is 157693321. The reversal of 157693290 is 92396751.

157693290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (157693259) and next prime (157693321).

It is a super-2 number, since 2×157693290² = 49734347422048200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309556 + ... + 310064.

It is an arithmetic number, because the mean of its divisors is an integer number (6196500).

Almost surely, 2^157693290 is an apocalyptic number.

157693290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 157693290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198288000).

157693290 is an abundant number, since it is smaller than the sum of its proper divisors (238882710).

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

157693290 is a wasteful number, since it uses less digits than its factorization.

157693290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 157693290 is about 12557.5988946932. The cubic root of 157693290 is about 540.2619785059.

The spelling of 157693290 in words is "one hundred fifty-seven million, six hundred ninety-three thousand, two hundred ninety".