157891890 has 32 divisors (see below), whose sum is σ = 408090816. Its totient is φ = 38865600.

The previous prime is 157891883. The next prime is 157891961. The reversal of 157891890 is 98198751.

157891890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 202036 + ... + 202815.

It is an arithmetic number, because the mean of its divisors is an integer number (12752838).

Almost surely, 2^157891890 is an apocalyptic number.

157891890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157891890 is an abundant number, since it is smaller than the sum of its proper divisors (250198926).

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

157891890 is a wasteful number, since it uses less digits than its factorization.

157891890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404874.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 157891890 is about 12565.5039692008. The cubic root of 157891890 is about 540.4886865612.

The spelling of 157891890 in words is "one hundred fifty-seven million, eight hundred ninety-one thousand, eight hundred ninety".