91373904 has 30 divisors (see below), whose sum is σ = 255720426. Its totient is φ = 30457920.

The previous prime is 91373879. The next prime is 91373921. The reversal of 91373904 is 40937319.

It can be written as a sum of positive squares in only one way, i.e., 82083600 + 9290304 = 9060^2 + 3048^2 .

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 5 ways as a sum of consecutive naturals, for example, 317127 + ... + 317414.

Almost surely, 2^91373904 is an apocalyptic number.

It is an amenable number.

91373904 is an abundant number, since it is smaller than the sum of its proper divisors (164346522).

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

91373904 is a wasteful number, since it uses less digits than its factorization.

91373904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634555 (or 634546 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 91373904 is about 9558.9698189711. The cubic root of 91373904 is about 450.4093460408.

It can be divided in two parts, 9137 and 3904, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 91373904 in words is "ninety-one million, three hundred seventy-three thousand, nine hundred four".