90420988 has 12 divisors (see below), whose sum is σ = 180842032. Its totient is φ = 38751840.

The previous prime is 90420961. The next prime is 90420991. The reversal of 90420988 is 88902409.

It is a happy number.

90420988 is an admirable number.

It is a super-2 number, since 2×90420988² = 16351910141792288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90420988.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1614633 + ... + 1614688.

Almost surely, 2^90420988 is an apocalyptic number.

It is an amenable number.

90420988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

90420988 is a wasteful number, since it uses less digits than its factorization.

90420988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3229332 (or 3229330 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 90420988 is about 9508.9951098946. The cubic root of 90420988 is about 448.8381352483.

The spelling of 90420988 in words is "ninety million, four hundred twenty thousand, nine hundred eighty-eight".