91919904 has 24 divisors (see below), whose sum is σ = 241290000. Its totient is φ = 30639936.

The previous prime is 91919903. The next prime is 91919911. The reversal of 91919904 is 40991919.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (91919903) 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, 478654 + ... + 478845.

It is an arithmetic number, because the mean of its divisors is an integer number (10053750).

Almost surely, 2^91919904 is an apocalyptic number.

It is an amenable number.

91919904 is an abundant number, since it is smaller than the sum of its proper divisors (149370096).

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

91919904 is a wasteful number, since it uses less digits than its factorization.

91919904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957512 (or 957504 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 91919904 is about 9587.4868448410. The cubic root of 91919904 is about 451.3046975488.

The spelling of 91919904 in words is "ninety-one million, nine hundred nineteen thousand, nine hundred four".