157566820 has 12 divisors (see below), whose sum is σ = 330890364. Its totient is φ = 63026720.

The previous prime is 157566817. The next prime is 157566847. The reversal of 157566820 is 28665751.

It can be written as a sum of positive squares in 2 ways, for example, as 17239104 + 140327716 = 4152^2 + 11846^2 .

It is a super-3 number, since 3×157566820³ (a number of 26 digits) contains 333 as substring.

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, 3939151 + ... + 3939190.

It is an arithmetic number, because the mean of its divisors is an integer number (27574197).

Almost surely, 2^157566820 is an apocalyptic number.

157566820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157566820 is an abundant number, since it is smaller than the sum of its proper divisors (173323544).

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

157566820 is a wasteful number, since it uses less digits than its factorization.

157566820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878350 (or 7878348 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 157566820 is about 12552.5622882342. The cubic root of 157566820 is about 540.1175098634.

The spelling of 157566820 in words is "one hundred fifty-seven million, five hundred sixty-six thousand, eight hundred twenty".