90218900 has 36 divisors (see below), whose sum is σ = 196542108. Its totient is φ = 35946240.

The previous prime is 90218899. The next prime is 90218927. The reversal of 90218900 is 981209.

It can be written as a sum of positive squares in 6 ways, for example, as 1331716 + 88887184 = 1154^2 + 9428^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26072 + ... + 29328.

It is an arithmetic number, because the mean of its divisors is an integer number (5459503).

Almost surely, 2^90218900 is an apocalyptic number.

It is an amenable number.

90218900 is an abundant number, since it is smaller than the sum of its proper divisors (106323208).

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

90218900 is a wasteful number, since it uses less digits than its factorization.

90218900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548 (or 3541 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 90218900 is about 9498.3630168572. The cubic root of 90218900 is about 448.5035062305.

The spelling of 90218900 in words is "ninety million, two hundred eighteen thousand, nine hundred".