999320640 has 56 divisors (see below), whose sum is σ = 3172846080. Its totient is φ = 266485248.

The previous prime is 999320617. The next prime is 999320653. The reversal of 999320640 is 46023999.

It is a junction number, because it is equal to n+sod(n) for n = 999320592 and 999320601.

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, 519520 + ... + 521439.

Almost surely, 2^999320640 is an apocalyptic number.

It is an amenable number.

999320640 is an abundant number, since it is smaller than the sum of its proper divisors (2173525440).

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

999320640 is a wasteful number, since it uses less digits than its factorization.

999320640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040979 (or 1040969 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 999320640 is about 31612.0331519502. The cubic root of 999320640 is about 999.7734953662.

The spelling of 999320640 in words is "nine hundred ninety-nine million, three hundred twenty thousand, six hundred forty".