90451890 has 48 divisors (see below), whose sum is σ = 243891648. Its totient is φ = 24119856.

The previous prime is 90451877. The next prime is 90451909. The reversal of 90451890 is 9815409.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16182 + ... + 21041.

It is an arithmetic number, because the mean of its divisors is an integer number (5081076).

Almost surely, 2^90451890 is an apocalyptic number.

90451890 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90451890 is an abundant number, since it is smaller than the sum of its proper divisors (153439758).

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

90451890 is a wasteful number, since it uses less digits than its factorization.

90451890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37245 (or 37233 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 90451890 is about 9510.6198536163. The cubic root of 90451890 is about 448.8892606069.

The spelling of 90451890 in words is "ninety million, four hundred fifty-one thousand, eight hundred ninety".