161933880 has 64 divisors (see below), whose sum is σ = 486887040. Its totient is φ = 43085952.

The previous prime is 161933879. The next prime is 161933897. The reversal of 161933880 is 88339161.

161933880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 64407 + ... + 66873.

It is an arithmetic number, because the mean of its divisors is an integer number (7607610).

Almost surely, 2^161933880 is an apocalyptic number.

161933880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161933880 is an abundant number, since it is smaller than the sum of its proper divisors (324953160).

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

161933880 is a wasteful number, since it uses less digits than its factorization.

161933880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028 (or 3024 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 161933880 is about 12725.3243573592. The cubic root of 161933880 is about 545.0620023167.

The spelling of 161933880 in words is "one hundred sixty-one million, nine hundred thirty-three thousand, eight hundred eighty".