90906321 has 16 divisors (see below), whose sum is σ = 132427008. Its totient is φ = 55011600.

The previous prime is 90906313. The next prime is 90906349. The reversal of 90906321 is 12360909.

It is not a de Polignac number, because 90906321 - 2³ = 90906313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90906301) 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, 25626 + ... + 28956.

It is an arithmetic number, because the mean of its divisors is an integer number (8276688).

Almost surely, 2^90906321 is an apocalyptic number.

It is an amenable number.

90906321 is a deficient number, since it is larger than the sum of its proper divisors (41520687).

90906321 is a wasteful number, since it uses less digits than its factorization.

90906321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4172.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 90906321 is about 9534.4806360913. The cubic root of 90906321 is about 449.6397462387.

The spelling of 90906321 in words is "ninety million, nine hundred six thousand, three hundred twenty-one".