989644642 has 32 divisors (see below), whose sum is σ = 1730736000. Its totient is φ = 415628928.

The previous prime is 989644637. The next prime is 989644657. The reversal of 989644642 is 246446989.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 989644642.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286558 + ... + 289990.

It is an arithmetic number, because the mean of its divisors is an integer number (54085500).

Almost surely, 2^989644642 is an apocalyptic number.

989644642 is a deficient number, since it is larger than the sum of its proper divisors (741091358).

989644642 is a wasteful number, since it uses less digits than its factorization.

989644642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850.

The product of its digits is 2985984, while the sum is 52.

The square root of 989644642 is about 31458.6179289555. The cubic root of 989644642 is about 996.5362301509.

The spelling of 989644642 in words is "nine hundred eighty-nine million, six hundred forty-four thousand, six hundred forty-two".