91998004 has 36 divisors (see below), whose sum is σ = 187273632. Its totient is φ = 38737440.

The previous prime is 91997993. The next prime is 91998007. The reversal of 91998004 is 40089919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91998007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103747 + ... + 104629.

Almost surely, 2^91998004 is an apocalyptic number.

It is an amenable number.

91998004 is an abundant number, since it is smaller than the sum of its proper divisors (95275628).

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

91998004 is a wasteful number, since it uses less digits than its factorization.

91998004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 91998004 is about 9591.5589973685. The cubic root of 91998004 is about 451.4324787928.

The spelling of 91998004 in words is "ninety-one million, nine hundred ninety-eight thousand, four".