990697505028 has 192 divisors, whose sum is σ = 3061991116800. Its totient is φ = 241735656960.

The previous prime is 990697505011. The next prime is 990697505033. The reversal of 990697505028 is 820505796099.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 491833 + ... + 1491071.

It is an arithmetic number, because the mean of its divisors is an integer number (15947870400).

Almost surely, 2^990697505028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990697505028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530995558400).

990697505028 is an abundant number, since it is smaller than the sum of its proper divisors (2071293611772).

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

990697505028 is a wasteful number, since it uses less digits than its factorization.

990697505028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999330 (or 999328 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 60.

The spelling of 990697505028 in words is "nine hundred ninety billion, six hundred ninety-seven million, five hundred five thousand, twenty-eight".