90924779988 has 60 divisors (see below), whose sum is σ = 271651818592. Its totient is φ = 25978507920.

The previous prime is 90924779987. The next prime is 90924780029. The reversal of 90924779988 is 88997742909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90924779987) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20042878 + ... + 20047413.

Almost surely, 2^90924779988 is an apocalyptic number.

It is an amenable number.

90924779988 is an abundant number, since it is smaller than the sum of its proper divisors (180727038604).

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

90924779988 is a wasteful number, since it uses less digits than its factorization.

90924779988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40090314 (or 40090303 counting only the distinct ones).

The product of its (nonzero) digits is 164602368, while the sum is 72.

The spelling of 90924779988 in words is "ninety billion, nine hundred twenty-four million, seven hundred seventy-nine thousand, nine hundred eighty-eight".