161878392 has 64 divisors (see below), whose sum is σ = 484260000. Its totient is φ = 49807872.

The previous prime is 161878363. The next prime is 161878411. The reversal of 161878392 is 293878161.

It is a super-2 number, since 2×161878392² = 52409227593011328, which contains 22 as substring.

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, 26017 + ... + 31632.

Almost surely, 2^161878392 is an apocalyptic number.

161878392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161878392 is an abundant number, since it is smaller than the sum of its proper divisors (322381608).

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

161878392 is a wasteful number, since it uses less digits than its factorization.

161878392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57677 (or 57667 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 161878392 is about 12723.1439510838. The cubic root of 161878392 is about 544.9997385180. Note that the first 3 decimals are identical.

The spelling of 161878392 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, three hundred ninety-two".