90321218 has 16 divisors (see below), whose sum is σ = 149848440. Its totient is φ = 40559616.

The previous prime is 90321211. The next prime is 90321229. The reversal of 90321218 is 81212309.

It can be written as a sum of positive squares in 4 ways, for example, as 51595489 + 38725729 = 7183^2 + 6223^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an alternating number because its digits alternate between odd and even.

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, 45983 + ... + 47906.

Almost surely, 2^90321218 is an apocalyptic number.

90321218 is a deficient number, since it is larger than the sum of its proper divisors (59527222).

90321218 is a wasteful number, since it uses less digits than its factorization.

90321218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93941.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 90321218 is about 9503.7475766142. The cubic root of 90321218 is about 448.6729926855.

The spelling of 90321218 in words is "ninety million, three hundred twenty-one thousand, two hundred eighteen".