999928840 has 32 divisors (see below), whose sum is σ = 2252055960. Its totient is φ = 399577600.

The previous prime is 999928819. The next prime is 999928847. The reversal of 999928840 is 48829999.

It can be written as a sum of positive squares in 4 ways, for example, as 736905316 + 263023524 = 27146^2 + 16218^2 .

It is not an unprimeable number, because it can be changed into a prime (999928847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30660 + ... + 54220.

Almost surely, 2^999928840 is an apocalyptic number.

It is an amenable number.

999928840 is an abundant number, since it is smaller than the sum of its proper divisors (1252127120).

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

999928840 is a wasteful number, since it uses less digits than its factorization.

999928840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24633 (or 24629 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 58.

The square root of 999928840 is about 31621.6514432754. The cubic root of 999928840 is about 999.9762794373.

The spelling of 999928840 in words is "nine hundred ninety-nine million, nine hundred twenty-eight thousand, eight hundred forty".