990641227776 has 96 divisors (see below), whose sum is σ = 2641480994880. Its totient is φ = 330161733632.

The previous prime is 990641227727. The next prime is 990641227799. The reversal of 990641227776 is 677722146099.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77733661 + ... + 77746403.

It is an arithmetic number, because the mean of its divisors is an integer number (27515427030).

Almost surely, 2^990641227776 is an apocalyptic number.

990641227776 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990641227776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1320740497440).

990641227776 is an abundant number, since it is smaller than the sum of its proper divisors (1650839767104).

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

990641227776 is a wasteful number, since it uses less digits than its factorization.

990641227776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25421 (or 25401 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 60.

The spelling of 990641227776 in words is "nine hundred ninety billion, six hundred forty-one million, two hundred twenty-seven thousand, seven hundred seventy-six".