161878400 has 48 divisors (see below), whose sum is σ = 399898140. Its totient is φ = 64750080.

The previous prime is 161878363. The next prime is 161878411. The reversal of 161878400 is 4878161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22094 + ... + 28493.

Almost surely, 2^161878400 is an apocalyptic number.

161878400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161878400 is an abundant number, since it is smaller than the sum of its proper divisors (238019740).

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

161878400 is an equidigital number, since it uses as much as digits as its factorization.

161878400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50611 (or 50594 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 161878400 is about 12723.1442654715. The cubic root of 161878400 is about 544.9997474959. Note that the first 3 decimals are identical.

The spelling of 161878400 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, four hundred".