90565818 has 96 divisors (see below), whose sum is σ = 229386240. Its totient is φ = 23677920.

The previous prime is 90565801. The next prime is 90565823. The reversal of 90565818 is 81856509.

It is a Harshad number since it is a multiple of its sum of digits (42).

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

It is a self number, because there is not a number n which added to its sum of digits gives 90565818.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 172905 + ... + 173427.

It is an arithmetic number, because the mean of its divisors is an integer number (2389440).

Almost surely, 2^90565818 is an apocalyptic number.

90565818 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 90565818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114693120).

90565818 is an abundant number, since it is smaller than the sum of its proper divisors (138820422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90565818 is a wasteful number, since it uses less digits than its factorization.

90565818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 90565818 is about 9516.6074837623. The cubic root of 90565818 is about 449.0776465700.

The spelling of 90565818 in words is "ninety million, five hundred sixty-five thousand, eight hundred eighteen".