999911688 has 64 divisors (see below), whose sum is σ = 2530362240. Its totient is φ = 329247744.

The previous prime is 999911687. The next prime is 999911701. The reversal of 999911688 is 886119999.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (999911687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1363770 + ... + 1364502.

It is an arithmetic number, because the mean of its divisors is an integer number (39536910).

Almost surely, 2^999911688 is an apocalyptic number.

It is an amenable number.

999911688 is an abundant number, since it is smaller than the sum of its proper divisors (1530450552).

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

999911688 is a wasteful number, since it uses less digits than its factorization.

999911688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358 (or 1354 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 60.

The square root of 999911688 is about 31621.3802355305. The cubic root of 999911688 is about 999.9705618001.

The spelling of 999911688 in words is "nine hundred ninety-nine million, nine hundred eleven thousand, six hundred eighty-eight".