91921472 has 28 divisors (see below), whose sum is σ = 186293760. Its totient is φ = 44981376.

The previous prime is 91921439. The next prime is 91921481. The reversal of 91921472 is 27412919.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 12272 + ... + 18287.

Almost surely, 2^91921472 is an apocalyptic number.

It is an amenable number.

91921472 is an abundant number, since it is smaller than the sum of its proper divisors (94372288).

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

91921472 is a wasteful number, since it uses less digits than its factorization.

91921472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30618 (or 30608 counting only the distinct ones).

The product of its digits is 9072, while the sum is 35.

The square root of 91921472 is about 9587.5686177466. The cubic root of 91921472 is about 451.3072637023.

The spelling of 91921472 in words is "ninety-one million, nine hundred twenty-one thousand, four hundred seventy-two".