999999072 has 72 divisors (see below), whose sum is σ = 2904291936. Its totient is φ = 326236416.

The previous prime is 999999067. The next prime is 999999103. The reversal of 999999072 is 270999999.

999999072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×999999072² = 1999996288001722368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23403 + ... + 50474.

It is an arithmetic number, because the mean of its divisors is an integer number (40337388).

Almost surely, 2^999999072 is an apocalyptic number.

It is an amenable number.

999999072 is an abundant number, since it is smaller than the sum of its proper divisors (1904292864).

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

999999072 is a wasteful number, since it uses less digits than its factorization.

999999072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73940 (or 73929 counting only the distinct ones).

The product of its (nonzero) digits is 7440174, while the sum is 63.

The square root of 999999072 is about 31622.7619287120. The cubic root of 999999072 is about 999.9996906666. Note that the first 3 decimals are identical.

The spelling of 999999072 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, seventy-two".