91920504 has 64 divisors (see below), whose sum is σ = 250014240. Its totient is φ = 27993600.

The previous prime is 91920503. The next prime is 91920509. The reversal of 91920504 is 40502919.

It is a happy number.

It is a super-2 number, since 2×91920504² = 16898758111228032, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91920503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30054 + ... + 32970.

Almost surely, 2^91920504 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 91920504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125007120).

91920504 is an abundant number, since it is smaller than the sum of its proper divisors (158093736).

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

91920504 is a wasteful number, since it uses less digits than its factorization.

91920504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040 (or 3036 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 91920504 is about 9587.5181355761. The cubic root of 91920504 is about 451.3056794988.

The spelling of 91920504 in words is "ninety-one million, nine hundred twenty thousand, five hundred four".