90234978 has 16 divisors (see below), whose sum is σ = 180852480. Its totient is φ = 30014576.

The previous prime is 90234953. The next prime is 90234983. The reversal of 90234978 is 87943209.

It is a super-4 number, since 4×90234978⁴ (a number of 33 digits) contains 4444 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12825 + ... + 18572.

It is an arithmetic number, because the mean of its divisors is an integer number (11303280).

Almost surely, 2^90234978 is an apocalyptic number.

90234978 is an abundant number, since it is smaller than the sum of its proper divisors (90617502).

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

90234978 is a wasteful number, since it uses less digits than its factorization.

90234978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31881.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 90234978 is about 9499.2093355184. The cubic root of 90234978 is about 448.5301474001.

The spelling of 90234978 in words is "ninety million, two hundred thirty-four thousand, nine hundred seventy-eight".