999961128 has 48 divisors (see below), whose sum is σ = 2709844020. Its totient is φ = 333121536.

The previous prime is 999961091. The next prime is 999961129. The reversal of 999961128 is 821169999.

It can be written as a sum of positive squares in 2 ways, for example, as 828403524 + 171557604 = 28782^2 + 13098^2 .

It is a super-2 number, since 2×999961128² = 1999844515022064768, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (999961129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165000 + ... + 170952.

Almost surely, 2^999961128 is an apocalyptic number.

It is an amenable number.

999961128 is an abundant number, since it is smaller than the sum of its proper divisors (1709882892).

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

999961128 is a wasteful number, since it uses less digits than its factorization.

999961128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8298 (or 8291 counting only the distinct ones).

The product of its digits is 629856, while the sum is 54.

The square root of 999961128 is about 31622.1619754248. The cubic root of 999961128 is about 999.9870424988.

It can be divided in two parts, 99996 and 1128, that added together give a square (101124 = 318²).

The spelling of 999961128 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, one hundred twenty-eight".