91929872 has 40 divisors (see below), whose sum is σ = 186758880. Its totient is φ = 43787520.

The previous prime is 91929823. The next prime is 91929883. The reversal of 91929872 is 27892919.

It is a happy number.

It is a super-2 number, since 2×91929872² = 16902202731872768, 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 7 ways as a sum of consecutive naturals, for example, 26579 + ... + 29837.

It is an arithmetic number, because the mean of its divisors is an integer number (4668972).

Almost surely, 2^91929872 is an apocalyptic number.

It is an amenable number.

91929872 is an abundant number, since it is smaller than the sum of its proper divisors (94829008).

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

91929872 is a wasteful number, since it uses less digits than its factorization.

91929872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351 (or 3345 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 91929872 is about 9588.0066750081. The cubic root of 91929872 is about 451.3210104561.

The spelling of 91929872 in words is "ninety-one million, nine hundred twenty-nine thousand, eight hundred seventy-two".