90218992 has 20 divisors (see below), whose sum is σ = 183999880. Its totient is φ = 42735168.

The previous prime is 90218969. The next prime is 90219001. The reversal of 90218992 is 29981209.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148083 + ... + 148690.

It is an arithmetic number, because the mean of its divisors is an integer number (9199994).

Almost surely, 2^90218992 is an apocalyptic number.

It is an amenable number.

90218992 is an abundant number, since it is smaller than the sum of its proper divisors (93780888).

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

90218992 is a wasteful number, since it uses less digits than its factorization.

90218992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296800 (or 296794 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 90218992 is about 9498.3678597957. The cubic root of 90218992 is about 448.5036586831.

The spelling of 90218992 in words is "ninety million, two hundred eighteen thousand, nine hundred ninety-two".