999964881 has 12 divisors (see below), whose sum is σ = 1446536052. Its totient is φ = 665654496.

The previous prime is 999964873. The next prime is 999964897. The reversal of 999964881 is 188469999.

It can be written as a sum of positive squares in 2 ways, for example, as 910832400 + 89132481 = 30180^2 + 9441^2 .

It is not a de Polignac number, because 999964881 - 2³ = 999964873 is a prime.

It is a super-2 number, since 2×999964881² = 1999859526466688322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999964811) 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, 75966 + ... + 88151.

It is an arithmetic number, because the mean of its divisors is an integer number (120544671).

Almost surely, 2^999964881 is an apocalyptic number.

It is an amenable number.

999964881 is a deficient number, since it is larger than the sum of its proper divisors (446571171).

999964881 is a wasteful number, since it uses less digits than its factorization.

999964881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164800 (or 164797 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 63.

The square root of 999964881 is about 31622.2213166627. The cubic root of 999964881 is about 999.9882935296.

The spelling of 999964881 in words is "nine hundred ninety-nine million, nine hundred sixty-four thousand, eight hundred eighty-one".