91872658432 has 88 divisors (see below), whose sum is σ = 185778121536. Its totient is φ = 45407428608.

The previous prime is 91872658421. The next prime is 91872658447. The reversal of 91872658432 is 23485627819.

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, 93461013 + ... + 93461995.

Almost surely, 2^91872658432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91872658432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92889060768).

91872658432 is an abundant number, since it is smaller than the sum of its proper divisors (93905463104).

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

91872658432 is a wasteful number, since it uses less digits than its factorization.

91872658432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963 (or 1945 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 91872658432 in words is "ninety-one billion, eight hundred seventy-two million, six hundred fifty-eight thousand, four hundred thirty-two".