91503864 has 64 divisors (see below), whose sum is σ = 259005600. Its totient is φ = 29922048.

The previous prime is 91503833. The next prime is 91503899. The reversal of 91503864 is 46830519.

91503864 is a `hidden beast` number, since 91 + 503 + 8 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7452 + ... + 15444.

Almost surely, 2^91503864 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 91503864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129502800).

91503864 is an abundant number, since it is smaller than the sum of its proper divisors (167501736).

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

91503864 is a wasteful number, since it uses less digits than its factorization.

91503864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8061 (or 8051 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 91503864 is about 9565.7652072377. The cubic root of 91503864 is about 450.6227821411.

The spelling of 91503864 in words is "ninety-one million, five hundred three thousand, eight hundred sixty-four".