90491320 has 32 divisors (see below), whose sum is σ = 204296400. Its totient is φ = 36073728.

The previous prime is 90491293. The next prime is 90491321. The reversal of 90491320 is 2319409.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90491321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8596 + ... + 15964.

Almost surely, 2^90491320 is an apocalyptic number.

It is an amenable number.

90491320 is an abundant number, since it is smaller than the sum of its proper divisors (113805080).

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

90491320 is a wasteful number, since it uses less digits than its factorization.

90491320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7687 (or 7683 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 90491320 is about 9512.6925736092. The cubic root of 90491320 is about 448.9544780842.

The spelling of 90491320 in words is "ninety million, four hundred ninety-one thousand, three hundred twenty".