989657864 has 32 divisors (see below), whose sum is σ = 2103528000. Its totient is φ = 432724032.

The previous prime is 989657849. The next prime is 989657891. The reversal of 989657864 is 468756989.

It is a junction number, because it is equal to n+sod(n) for n = 989657797 and 989657806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248444 + ... + 252395.

It is an arithmetic number, because the mean of its divisors is an integer number (65735250).

Almost surely, 2^989657864 is an apocalyptic number.

It is an amenable number.

989657864 is an abundant number, since it is smaller than the sum of its proper divisors (1113870136).

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

989657864 is a wasteful number, since it uses less digits than its factorization.

989657864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500877 (or 500873 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 62.

The square root of 989657864 is about 31458.8280773458. The cubic root of 989657864 is about 996.5406681558.

The spelling of 989657864 in words is "nine hundred eighty-nine million, six hundred fifty-seven thousand, eight hundred sixty-four".