990072 has 24 divisors (see below), whose sum is σ = 2681640. Its totient is φ = 330000.

The previous prime is 990053. The next prime is 990137. The reversal of 990072 is 270099.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

990072 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6804 + ... + 6947.

It is an arithmetic number, because the mean of its divisors is an integer number (111735).

2⁹⁹⁰⁰⁷² is an apocalyptic number.

It is an amenable number.

990072 is an abundant number, since it is smaller than the sum of its proper divisors (1691568).

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

990072 is a wasteful number, since it uses less digits than its factorization.

990072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13763 (or 13756 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 990072 is about 995.0236178102. The cubic root of 990072 is about 99.6679654172.

Adding to 990072 its sum of digits (27), we get a palindrome (990099).

The spelling of 990072 in words is "nine hundred ninety thousand, seventy-two".