990475304640 has 112 divisors (see below), whose sum is σ = 3281487821568. Its totient is φ = 252642970624.

The previous prime is 990475304639. The next prime is 990475304641. The reversal of 990475304640 is 46403574099.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (990475304639) and next prime (990475304641).

It is not an unprimeable number, because it can be changed into a prime (990475304641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22407162 + ... + 22451321.

Almost surely, 2^990475304640 is an apocalyptic number.

It is an amenable number.

990475304640 is an abundant number, since it is smaller than the sum of its proper divisors (2291012516928).

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

990475304640 is a wasteful number, since it uses less digits than its factorization.

990475304640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44858526 (or 44858516 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 51.

The spelling of 990475304640 in words is "nine hundred ninety billion, four hundred seventy-five million, three hundred four thousand, six hundred forty".