90992640 has 104 divisors (see below), whose sum is σ = 291337488. Its totient is φ = 24248320.

The previous prime is 90992639. The next prime is 90992701. The reversal of 90992640 is 4629909.

It is a congruent number.

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, 60700 + ... + 62180.

It is an arithmetic number, because the mean of its divisors is an integer number (2801322).

Almost surely, 2^90992640 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 90992640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145668744).

90992640 is an abundant number, since it is smaller than the sum of its proper divisors (200344848).

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

90992640 is a wasteful number, since it uses less digits than its factorization.

90992640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513 (or 1491 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 90992640 is about 9539.0062375491. The cubic root of 90992640 is about 449.7820178823.

The spelling of 90992640 in words is "ninety million, nine hundred ninety-two thousand, six hundred forty".