161872864 has 12 divisors (see below), whose sum is σ = 318687264. Its totient is φ = 80936416.

The previous prime is 161872859. The next prime is 161872877. The reversal of 161872864 is 468278161.

It is a self number, because there is not a number n which added to its sum of digits gives 161872864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2529232 + ... + 2529295.

It is an arithmetic number, because the mean of its divisors is an integer number (26557272).

Almost surely, 2^161872864 is an apocalyptic number.

It is an amenable number.

161872864 is a deficient number, since it is larger than the sum of its proper divisors (156814400).

161872864 is an equidigital number, since it uses as much as digits as its factorization.

161872864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5058537 (or 5058529 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 161872864 is about 12722.9267073264. The cubic root of 161872864 is about 544.9935346987.

The spelling of 161872864 in words is "one hundred sixty-one million, eight hundred seventy-two thousand, eight hundred sixty-four".