991479670 has 16 divisors (see below), whose sum is σ = 1785080880. Its totient is φ = 396499104.

The previous prime is 991479667. The next prime is 991479683. The reversal of 991479670 is 76974199.

It is a congruent number.

It is an unprimeable number.

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, 47761 + ... + 65299.

It is an arithmetic number, because the mean of its divisors is an integer number (111567555).

Almost surely, 2^991479670 is an apocalyptic number.

991479670 is a deficient number, since it is larger than the sum of its proper divisors (793601210).

991479670 is a wasteful number, since it uses less digits than its factorization.

991479670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23199.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 991479670 is about 31487.7701655738. The cubic root of 991479670 is about 997.1517853753.

The spelling of 991479670 in words is "nine hundred ninety-one million, four hundred seventy-nine thousand, six hundred seventy".