161872830 has 80 divisors (see below), whose sum is σ = 497455200. Its totient is φ = 36998208.

The previous prime is 161872771. The next prime is 161872847. The reversal of 161872830 is 38278161.

161872830 is a `hidden beast` number, since 1 + 618 + 7 + 2 + 8 + 30 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8605 + ... + 19944.

It is an arithmetic number, because the mean of its divisors is an integer number (6218190).

Almost surely, 2^161872830 is an apocalyptic number.

161872830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161872830 is an abundant number, since it is smaller than the sum of its proper divisors (335582370).

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

161872830 is a wasteful number, since it uses less digits than its factorization.

161872830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28575 (or 28566 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 161872830 is about 12722.9253711558. The cubic root of 161872830 is about 544.9934965416.

The spelling of 161872830 in words is "one hundred sixty-one million, eight hundred seventy-two thousand, eight hundred thirty".