990685617 has 16 divisors (see below), whose sum is σ = 1373423040. Its totient is φ = 634434752.

The previous prime is 990685607. The next prime is 990685667. The reversal of 990685617 is 716586099.

990685617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 990685617 - 2¹⁴ = 990669233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990685617.

It is not an unprimeable number, because it can be changed into a prime (990685607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11763 + ... + 46040.

It is an arithmetic number, because the mean of its divisors is an integer number (85838940).

Almost surely, 2^990685617 is an apocalyptic number.

It is an amenable number.

990685617 is a deficient number, since it is larger than the sum of its proper divisors (382737423).

990685617 is a wasteful number, since it uses less digits than its factorization.

990685617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58032.

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 990685617 is about 31475.1587287499. The cubic root of 990685617 is about 996.8855157245.

The spelling of 990685617 in words is "nine hundred ninety million, six hundred eighty-five thousand, six hundred seventeen".