90320664 has 64 divisors (see below), whose sum is σ = 260663040. Its totient is φ = 25545600.

The previous prime is 90320647. The next prime is 90320669. The reversal of 90320664 is 46602309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90320669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14307 + ... + 19629.

It is an arithmetic number, because the mean of its divisors is an integer number (4072860).

Almost surely, 2^90320664 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 90320664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130331520).

90320664 is an abundant number, since it is smaller than the sum of its proper divisors (170342376).

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

90320664 is a wasteful number, since it uses less digits than its factorization.

90320664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440 (or 5436 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 90320664 is about 9503.7184301725. The cubic root of 90320664 is about 448.6720753472.

The spelling of 90320664 in words is "ninety million, three hundred twenty thousand, six hundred sixty-four".