990665684 has 24 divisors (see below), whose sum is σ = 1852499880. Its totient is φ = 461915136.

The previous prime is 990665677. The next prime is 990665707. The reversal of 990665684 is 486566099.

It can be written as a sum of positive squares in 4 ways, for example, as 64802500 + 925863184 = 8050^2 + 30428^2 .

It is a congruent number.

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, 59417 + ... + 74240.

It is an arithmetic number, because the mean of its divisors is an integer number (77187495).

Almost surely, 2^990665684 is an apocalyptic number.

It is an amenable number.

990665684 is a deficient number, since it is larger than the sum of its proper divisors (861834196).

990665684 is a wasteful number, since it uses less digits than its factorization.

990665684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133787 (or 133785 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 53.

The square root of 990665684 is about 31474.8420806205. The cubic root of 990665684 is about 996.8788297649.

The spelling of 990665684 in words is "nine hundred ninety million, six hundred sixty-five thousand, six hundred eighty-four".