90990500 has 24 divisors (see below), whose sum is σ = 198724344. Its totient is φ = 36396000.

The previous prime is 90990479. The next prime is 90990503. The reversal of 90990500 is 509909.

It can be written as a sum of positive squares in 4 ways, for example, as 1763584 + 89226916 = 1328^2 + 9446^2 .

It is not an unprimeable number, because it can be changed into a prime (90990503) 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, 90491 + ... + 91490.

It is an arithmetic number, because the mean of its divisors is an integer number (8280181).

Almost surely, 2^90990500 is an apocalyptic number.

It is an amenable number.

90990500 is an abundant number, since it is smaller than the sum of its proper divisors (107733844).

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

90990500 is a wasteful number, since it uses less digits than its factorization.

90990500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182000 (or 181988 counting only the distinct ones).

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 90990500 is about 9538.8940658758. The cubic root of 90990500 is about 449.7784918056.

The spelling of 90990500 in words is "ninety million, nine hundred ninety thousand, five hundred".