990761984 has 132 divisors (see below), whose sum is σ = 2173422720. Its totient is φ = 450785280.

The previous prime is 990761983. The next prime is 990762001. The reversal of 990761984 is 489167099.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990761983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16792547 + ... + 16792605.

Almost surely, 2^990761984 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 990761984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086711360).

990761984 is an abundant number, since it is smaller than the sum of its proper divisors (1182660736).

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

990761984 is a wasteful number, since it uses less digits than its factorization.

990761984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 990761984 is about 31476.3718366650. The cubic root of 990761984 is about 996.9111300395.

The spelling of 990761984 in words is "nine hundred ninety million, seven hundred sixty-one thousand, nine hundred eighty-four".