161802920 has 32 divisors (see below), whose sum is σ = 365904000. Its totient is φ = 64392768.

The previous prime is 161802899. The next prime is 161802941. The reversal of 161802920 is 29208161.

It is an interprime number because it is at equal distance from previous prime (161802899) and next prime (161802941).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2204 + ... + 18123.

It is an arithmetic number, because the mean of its divisors is an integer number (11434500).

Almost surely, 2^161802920 is an apocalyptic number.

161802920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161802920 is an abundant number, since it is smaller than the sum of its proper divisors (204101080).

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

161802920 is a wasteful number, since it uses less digits than its factorization.

161802920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20537 (or 20533 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 161802920 is about 12720.1776717151. The cubic root of 161802920 is about 544.9150275739.

The spelling of 161802920 in words is "one hundred sixty-one million, eight hundred two thousand, nine hundred twenty".