90978570 has 48 divisors (see below), whose sum is σ = 246834432. Its totient is φ = 23205600.

The previous prime is 90978553. The next prime is 90978599. The reversal of 90978570 is 7587909.

90978570 is a `hidden beast` number, since 9 + 0 + 9 + 78 + 570 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 19906 + ... + 24045.

It is an arithmetic number, because the mean of its divisors is an integer number (5142384).

Almost surely, 2^90978570 is an apocalyptic number.

90978570 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90978570 is an abundant number, since it is smaller than the sum of its proper divisors (155855862).

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

90978570 is a wasteful number, since it uses less digits than its factorization.

90978570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43987 (or 43984 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 90978570 is about 9538.2687108301. The cubic root of 90978570 is about 449.7588337390.

The spelling of 90978570 in words is "ninety million, nine hundred seventy-eight thousand, five hundred seventy".