990784631 has 8 divisors (see below), whose sum is σ = 1034246304. Its totient is φ = 948201120.

The previous prime is 990784609. The next prime is 990784637. The reversal of 990784631 is 136487099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990784631 is a prime.

It is a super-2 number, since 2×990784631² = 1963308370051612322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990784637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217235 + ... + 221748.

It is an arithmetic number, because the mean of its divisors is an integer number (129280788).

Almost surely, 2^990784631 is an apocalyptic number.

990784631 is a deficient number, since it is larger than the sum of its proper divisors (43461673).

990784631 is a wasteful number, since it uses less digits than its factorization.

990784631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439081.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 990784631 is about 31476.7315806454. The cubic root of 990784631 is about 996.9187258343.

The spelling of 990784631 in words is "nine hundred ninety million, seven hundred eighty-four thousand, six hundred thirty-one".