91439872 has 36 divisors (see below), whose sum is σ = 193268376. Its totient is φ = 43028480.

The previous prime is 91439869. The next prime is 91439891. The reversal of 91439872 is 27893419.

It is a super-2 number, since 2×91439872² = 16722500382752768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6154 + ... + 14857.

It is an arithmetic number, because the mean of its divisors is an integer number (5368566).

Almost surely, 2^91439872 is an apocalyptic number.

It is an amenable number.

91439872 is an abundant number, since it is smaller than the sum of its proper divisors (101828504).

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

91439872 is a wasteful number, since it uses less digits than its factorization.

91439872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21044 (or 21030 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 91439872 is about 9562.4197774413. The cubic root of 91439872 is about 450.5177119779.

The spelling of 91439872 in words is "ninety-one million, four hundred thirty-nine thousand, eight hundred seventy-two".