999665072 has 60 divisors (see below), whose sum is σ = 2290116816. Its totient is φ = 421384320.

The previous prime is 999665057. The next prime is 999665081. The reversal of 999665072 is 270566999.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37373 + ... + 58275.

Almost surely, 2^999665072 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 999665072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1145058408).

999665072 is an abundant number, since it is smaller than the sum of its proper divisors (1290451744).

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

999665072 is a wasteful number, since it uses less digits than its factorization.

999665072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20986 (or 20973 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 53.

The square root of 999665072 is about 31617.4804815311. The cubic root of 999665072 is about 999.8883448669. Note that the first 3 decimals are identical.

The spelling of 999665072 in words is "nine hundred ninety-nine million, six hundred sixty-five thousand, seventy-two".