165572730 has 24 divisors (see below), whose sum is σ = 430489332. Its totient is φ = 44152704.

The previous prime is 165572711. The next prime is 165572731. The reversal of 165572730 is 37275561.

165572730 is a `hidden beast` number, since 16 + 5 + 572 + 73 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 151216209 + 14356521 = 12297^2 + 3789^2 .

It is not an unprimeable number, because it can be changed into a prime (165572731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 919759 + ... + 919938.

Almost surely, 2^165572730 is an apocalyptic number.

165572730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165572730 is an abundant number, since it is smaller than the sum of its proper divisors (264916602).

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

165572730 is a wasteful number, since it uses less digits than its factorization.

165572730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839710 (or 1839707 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 165572730 is about 12867.5067515040. The cubic root of 165572730 is about 549.1145311331.

The spelling of 165572730 in words is "one hundred sixty-five million, five hundred seventy-two thousand, seven hundred thirty".