999696672 has 144 divisors (see below), whose sum is σ = 3085500600. Its totient is φ = 305197056.

The previous prime is 999696667. The next prime is 999696701. The reversal of 999696672 is 276696999.

It can be written as a sum of positive squares in 4 ways, for example, as 862244496 + 137452176 = 29364^2 + 11724^2 .

It is a tau number, because it is divible by the number of its divisors (144).

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 23 ways as a sum of consecutive naturals, for example, 511954 + ... + 513902.

Almost surely, 2^999696672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999696672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1542750300).

999696672 is an abundant number, since it is smaller than the sum of its proper divisors (2085803928).

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

999696672 is a wasteful number, since it uses less digits than its factorization.

999696672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115 (or 2104 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 63.

The square root of 999696672 is about 31617.9802011450. The cubic root of 999696672 is about 999.8988804418.

The spelling of 999696672 in words is "nine hundred ninety-nine million, six hundred ninety-six thousand, six hundred seventy-two".