91988004 has 12 divisors (see below), whose sum is σ = 214638704. Its totient is φ = 30662664.

The previous prime is 91987999. The next prime is 91988041. The reversal of 91988004 is 40088919.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3832822 + ... + 3832845.

Almost surely, 2^91988004 is an apocalyptic number.

It is an amenable number.

91988004 is an abundant number, since it is smaller than the sum of its proper divisors (122650700).

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

91988004 is a wasteful number, since it uses less digits than its factorization.

91988004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7665674 (or 7665672 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 91988004 is about 9591.0376915118. The cubic root of 91988004 is about 451.4161215961.

The spelling of 91988004 in words is "ninety-one million, nine hundred eighty-eight thousand, four".