90731648 has 64 divisors (see below), whose sum is σ = 208422720. Its totient is φ = 38538240.

The previous prime is 90731623. The next prime is 90731657. The reversal of 90731648 is 84613709.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116990 + ... + 117762.

It is an arithmetic number, because the mean of its divisors is an integer number (3256605).

Almost surely, 2^90731648 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 90731648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104211360).

90731648 is an abundant number, since it is smaller than the sum of its proper divisors (117691072).

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

90731648 is a wasteful number, since it uses less digits than its factorization.

90731648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925 (or 913 counting only the distinct ones).

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

The square root of 90731648 is about 9525.3161627318. The cubic root of 90731648 is about 449.3515730948.

The spelling of 90731648 in words is "ninety million, seven hundred thirty-one thousand, six hundred forty-eight".