90021623994 has 48 divisors (see below), whose sum is σ = 206574496128. Its totient is φ = 29368749312.

The previous prime is 90021623981. The next prime is 90021624001. The reversal of 90021623994 is 49932612009.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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, 1947687 + ... + 1993370.

It is an arithmetic number, because the mean of its divisors is an integer number (4303635336).

Almost surely, 2^90021623994 is an apocalyptic number.

90021623994 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

90021623994 is an abundant number, since it is smaller than the sum of its proper divisors (116552872134).

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

90021623994 is a wasteful number, since it uses less digits than its factorization.

90021623994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941121 (or 3941109 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 90021623994 in words is "ninety billion, twenty-one million, six hundred twenty-three thousand, nine hundred ninety-four".