91533920 has 24 divisors (see below), whose sum is σ = 216249264. Its totient is φ = 36613504.

The previous prime is 91533881. The next prime is 91533929. The reversal of 91533920 is 2933519.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91533929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285884 + ... + 286203.

It is an arithmetic number, because the mean of its divisors is an integer number (9010386).

Almost surely, 2^91533920 is an apocalyptic number.

It is an amenable number.

91533920 is an abundant number, since it is smaller than the sum of its proper divisors (124715344).

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

91533920 is a wasteful number, since it uses less digits than its factorization.

91533920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572102 (or 572094 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 91533920 is about 9567.3360973680. The cubic root of 91533920 is about 450.6721149783.

The spelling of 91533920 in words is "ninety-one million, five hundred thirty-three thousand, nine hundred twenty".