999551680 has 28 divisors (see below), whose sum is σ = 2380183200. Its totient is φ = 399820544.

The previous prime is 999551617. The next prime is 999551689. The reversal of 999551680 is 86155999.

It is not an unprimeable number, because it can be changed into a prime (999551689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561480 + ... + 1562119.

Almost surely, 2^999551680 is an apocalyptic number.

It is an amenable number.

999551680 is an abundant number, since it is smaller than the sum of its proper divisors (1380631520).

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

999551680 is a wasteful number, since it uses less digits than its factorization.

999551680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123616 (or 3123606 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 52.

The square root of 999551680 is about 31615.6872454166. The cubic root of 999551680 is about 999.8505376621.

The spelling of 999551680 in words is "nine hundred ninety-nine million, five hundred fifty-one thousand, six hundred eighty".