91638704 has 40 divisors (see below), whose sum is σ = 189050400. Its totient is φ = 42882048.

The previous prime is 91638689. The next prime is 91638709. The reversal of 91638704 is 40783619.

It is not an unprimeable number, because it can be changed into a prime (91638709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53282 + ... + 54974.

It is an arithmetic number, because the mean of its divisors is an integer number (4726260).

Almost surely, 2^91638704 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 91638704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94525200).

91638704 is an abundant number, since it is smaller than the sum of its proper divisors (97411696).

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

91638704 is a wasteful number, since it uses less digits than its factorization.

91638704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1911 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 91638704 is about 9572.8106635408. The cubic root of 91638704 is about 450.8440192613.

The spelling of 91638704 in words is "ninety-one million, six hundred thirty-eight thousand, seven hundred four".