990889168 has 20 divisors (see below), whose sum is σ = 1986050340. Its totient is φ = 478360064.

The previous prime is 990889153. The next prime is 990889169. The reversal of 990889168 is 861988099.

990889168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 705008704 + 285880464 = 26552^2 + 16908^2 .

It is a super-2 number, since 2×990889168² = 1963722686519464448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990889169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067305 + ... + 1068232.

It is an arithmetic number, because the mean of its divisors is an integer number (99302517).

Almost surely, 2^990889168 is an apocalyptic number.

It is an amenable number.

990889168 is an abundant number, since it is smaller than the sum of its proper divisors (995161172).

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

990889168 is a wasteful number, since it uses less digits than its factorization.

990889168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135574 (or 2135568 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 58.

The square root of 990889168 is about 31478.3920809180. The cubic root of 990889168 is about 996.9537860026.

The spelling of 990889168 in words is "nine hundred ninety million, eight hundred eighty-nine thousand, one hundred sixty-eight".