990731689488 has 60 divisors (see below), whose sum is σ = 2787038972380. Its totient is φ = 328532779008.

The previous prime is 990731689469. The next prime is 990731689547. The reversal of 990731689488 is 884986137099.

990731689488 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 342983579904 + 647748109584 = 585648^2 + 804828^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17796253 + ... + 17851836.

Almost surely, 2^990731689488 is an apocalyptic number.

It is an amenable number.

990731689488 is an abundant number, since it is smaller than the sum of its proper divisors (1796307282892).

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

990731689488 is a wasteful number, since it uses less digits than its factorization.

990731689488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35648296 (or 35648287 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 72.

The spelling of 990731689488 in words is "nine hundred ninety billion, seven hundred thirty-one million, six hundred eighty-nine thousand, four hundred eighty-eight".