999960640 has 84 divisors (see below), whose sum is σ = 2769959916. Its totient is φ = 342838272.

The previous prime is 999960613. The next prime is 999960667. The reversal of 999960640 is 46069999.

It is an interprime number because it is at equal distance from previous prime (999960613) and next prime (999960667).

It can be written as a sum of positive squares in 2 ways, for example, as 174662656 + 825297984 = 13216^2 + 28728^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16207 + ... + 47566.

Almost surely, 2^999960640 is an apocalyptic number.

It is an amenable number.

999960640 is an abundant number, since it is smaller than the sum of its proper divisors (1769999276).

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

999960640 is a wasteful number, since it uses less digits than its factorization.

999960640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63804 (or 63787 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 52.

The square root of 999960640 is about 31622.1542593164. The cubic root of 999960640 is about 999.9868798279.

The spelling of 999960640 in words is "nine hundred ninety-nine million, nine hundred sixty thousand, six hundred forty".