161578992 has 40 divisors (see below), whose sum is σ = 421557840. Its totient is φ = 53324800.

The previous prime is 161578987. The next prime is 161579017. The reversal of 161578992 is 299875161.

It is a super-2 number, since 2×161578992² = 52215541311472128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11817 + ... + 21512.

It is an arithmetic number, because the mean of its divisors is an integer number (10538946).

Almost surely, 2^161578992 is an apocalyptic number.

161578992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161578992 is an abundant number, since it is smaller than the sum of its proper divisors (259978848).

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

161578992 is a wasteful number, since it uses less digits than its factorization.

161578992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33441 (or 33435 counting only the distinct ones).

The product of its digits is 272160, while the sum is 48.

The square root of 161578992 is about 12711.3725458740. The cubic root of 161578992 is about 544.6635321817.

The spelling of 161578992 in words is "one hundred sixty-one million, five hundred seventy-eight thousand, nine hundred ninety-two".