90321217 has 8 divisors (see below), whose sum is σ = 103286016. Its totient is φ = 77371872.

The previous prime is 90321211. The next prime is 90321229. The reversal of 90321217 is 71212309.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90321217 - 2⁷ = 90321089 is a prime.

It is a super-2 number, since 2×90321217² = 16315844480722178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90321191 and 90321200.

It is not an unprimeable number, because it can be changed into a prime (90321211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14493 + ... + 19765.

It is an arithmetic number, because the mean of its divisors is an integer number (12910752).

Almost surely, 2^90321217 is an apocalyptic number.

It is an amenable number.

90321217 is a deficient number, since it is larger than the sum of its proper divisors (12964799).

90321217 is a wasteful number, since it uses less digits than its factorization.

90321217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7727.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 90321217 is about 9503.7475240034. The cubic root of 90321217 is about 448.6729910296.

The spelling of 90321217 in words is "ninety million, three hundred twenty-one thousand, two hundred seventeen".