90991684 has 48 divisors (see below), whose sum is σ = 202849920. Its totient is φ = 34767360.

The previous prime is 90991679. The next prime is 90991709. The reversal of 90991684 is 48619909.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4014 + ... + 14074.

It is an arithmetic number, because the mean of its divisors is an integer number (4226040).

Almost surely, 2^90991684 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 90991684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101424960).

90991684 is an abundant number, since it is smaller than the sum of its proper divisors (111858236).

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

90991684 is a wasteful number, since it uses less digits than its factorization.

90991684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10108 (or 10106 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 90991684 is about 9538.9561273758. The cubic root of 90991684 is about 449.7804426885.

The spelling of 90991684 in words is "ninety million, nine hundred ninety-one thousand, six hundred eighty-four".