999964880 has 20 divisors (see below), whose sum is σ = 2324918532. Its totient is φ = 399985920.

The previous prime is 999964873. The next prime is 999964897. The reversal of 999964880 is 88469999.

It can be written as a sum of positive squares in 2 ways, for example, as 564157504 + 435807376 = 23752^2 + 20876^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×999964880² = 1999859522466828800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6249701 + ... + 6249860.

Almost surely, 2^999964880 is an apocalyptic number.

It is an amenable number.

999964880 is an abundant number, since it is smaller than the sum of its proper divisors (1324953652).

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

999964880 is a wasteful number, since it uses less digits than its factorization.

999964880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12499574 (or 12499568 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 62.

The square root of 999964880 is about 31622.2213008511. The cubic root of 999964880 is about 999.9882931963.

The spelling of 999964880 in words is "nine hundred ninety-nine million, nine hundred sixty-four thousand, eight hundred eighty".