999966280 has 16 divisors (see below), whose sum is σ = 2249924220. Its totient is φ = 399986496.

The previous prime is 999966277. The next prime is 999966281. The reversal of 999966280 is 82669999.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 999444996 + 521284 = 31614^2 + 722^2 .

It is a super-2 number, since 2×999966280² = 1999865122274076800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999966281) 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, 12499539 + ... + 12499618.

Almost surely, 2^999966280 is an apocalyptic number.

It is an amenable number.

999966280 is an abundant number, since it is smaller than the sum of its proper divisors (1249957940).

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

999966280 is a wasteful number, since it uses less digits than its factorization.

999966280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24999168 (or 24999164 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 58.

The square root of 999966280 is about 31622.2434371757. The cubic root of 999966280 is about 999.9887598737.

It can be divided in two parts, 99996 and 6280, that added together give a square (106276 = 326²).

The spelling of 999966280 in words is "nine hundred ninety-nine million, nine hundred sixty-six thousand, two hundred eighty".