989868990 has 32 divisors (see below), whose sum is σ = 2591657856. Its totient is φ = 239968160.

The previous prime is 989868989. The next prime is 989868991. The reversal of 989868990 is 99868989.

989868990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (989868989) and next prime (989868991).

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989868991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1499472 + ... + 1500131.

It is an arithmetic number, because the mean of its divisors is an integer number (80989308).

Almost surely, 2^989868990 is an apocalyptic number.

989868990 is an abundant number, since it is smaller than the sum of its proper divisors (1601788866).

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

989868990 is a wasteful number, since it uses less digits than its factorization.

989868990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999624.

The product of its (nonzero) digits is 20155392, while the sum is 66.

The square root of 989868990 is about 31462.1834906607. The cubic root of 989868990 is about 996.6115278920.

The spelling of 989868990 in words is "nine hundred eighty-nine million, eight hundred sixty-eight thousand, nine hundred ninety".