90421556 has 12 divisors (see below), whose sum is σ = 165117792. Its totient is φ = 43245048.

The previous prime is 90421543. The next prime is 90421559. The reversal of 90421556 is 65512409.

It is a happy number.

It is a super-2 number, since 2×90421556² = 16352115578922272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90421559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491330 + ... + 491513.

It is an arithmetic number, because the mean of its divisors is an integer number (13759816).

Almost surely, 2^90421556 is an apocalyptic number.

It is an amenable number.

90421556 is a deficient number, since it is larger than the sum of its proper divisors (74696236).

90421556 is a wasteful number, since it uses less digits than its factorization.

90421556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982870 (or 982868 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 90421556 is about 9509.0249763054. The cubic root of 90421556 is about 448.8390750726.

The spelling of 90421556 in words is "ninety million, four hundred twenty-one thousand, five hundred fifty-six".