999000720 has 60 divisors (see below), whose sum is σ = 3354979836. Its totient is φ = 266400000.

The previous prime is 999000707. The next prime is 999000773. The reversal of 999000720 is 27000999.

It can be written as a sum of positive squares in 2 ways, for example, as 669360384 + 329640336 = 25872^2 + 18156^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 693031 + ... + 694470.

Almost surely, 2^999000720 is an apocalyptic number.

999000720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

999000720 is an abundant number, since it is smaller than the sum of its proper divisors (2355979116).

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

999000720 is a wasteful number, since it uses less digits than its factorization.

999000720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387520 (or 1387511 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 999000720 is about 31606.9726484521. The cubic root of 999000720 is about 999.6667956539. Note that the first 3 decimals are identical.

The spelling of 999000720 in words is "nine hundred ninety-nine million, seven hundred twenty", and thus it is an aban number.