990625606464 has 112 divisors (see below), whose sum is σ = 2826382082048. Its totient is φ = 304404645888.

The previous prime is 990625606403. The next prime is 990625606499. The reversal of 990625606464 is 464606526099.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1627329 + ... + 2151615.

It is an arithmetic number, because the mean of its divisors is an integer number (25235554304).

Almost surely, 2^990625606464 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 990625606464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1413191041024).

990625606464 is an abundant number, since it is smaller than the sum of its proper divisors (1835756475584).

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

990625606464 is a wasteful number, since it uses less digits than its factorization.

990625606464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525072 (or 525062 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 57.

The spelling of 990625606464 in words is "nine hundred ninety billion, six hundred twenty-five million, six hundred six thousand, four hundred sixty-four".