90991891982 has 8 divisors (see below), whose sum is σ = 140890671552. Its totient is φ = 44028334800.

The previous prime is 90991891919. The next prime is 90991892027. The reversal of 90991891982 is 28919819909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 733805519 + ... + 733805642.

It is an arithmetic number, because the mean of its divisors is an integer number (17611333944).

Almost surely, 2^90991891982 is an apocalyptic number.

90991891982 is a deficient number, since it is larger than the sum of its proper divisors (49898779570).

90991891982 is a wasteful number, since it uses less digits than its factorization.

90991891982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467611194.

The product of its (nonzero) digits is 7558272, while the sum is 65.

The spelling of 90991891982 in words is "ninety billion, nine hundred ninety-one million, eight hundred ninety-one thousand, nine hundred eighty-two".