90684321 has 32 divisors (see below), whose sum is σ = 156656640. Its totient is φ = 45313344.

The previous prime is 90684313. The next prime is 90684343. The reversal of 90684321 is 12348609.

It is not a de Polignac number, because 90684321 - 2³ = 90684313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90684311) 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, 3555 + ... + 13928.

It is an arithmetic number, because the mean of its divisors is an integer number (4895520).

Almost surely, 2^90684321 is an apocalyptic number.

90684321 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

90684321 is a deficient number, since it is larger than the sum of its proper divisors (65972319).

90684321 is a wasteful number, since it uses less digits than its factorization.

90684321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17525.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 90684321 is about 9522.8315641935. The cubic root of 90684321 is about 449.2734299805.

The spelling of 90684321 in words is "ninety million, six hundred eighty-four thousand, three hundred twenty-one".