90320321 has 32 divisors (see below), whose sum is σ = 115492608. Its totient is φ = 68739840.

The previous prime is 90320317. The next prime is 90320369. The reversal of 90320321 is 12302309.

It is not a de Polignac number, because 90320321 - 2² = 90320317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90320293 and 90320302.

It is not an unprimeable number, because it can be changed into a prime (90320311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294050 + ... + 294356.

It is an arithmetic number, because the mean of its divisors is an integer number (3609144).

Almost surely, 2^90320321 is an apocalyptic number.

90320321 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

90320321 is a deficient number, since it is larger than the sum of its proper divisors (25172287).

90320321 is a wasteful number, since it uses less digits than its factorization.

90320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 90320321 is about 9503.7003845870. The cubic root of 90320321 is about 448.6715073903.

The spelling of 90320321 in words is "ninety million, three hundred twenty thousand, three hundred twenty-one".