1989582864 has 40 divisors (see below), whose sum is σ = 5185254432. Its totient is φ = 657323520.

The previous prime is 1989582863. The next prime is 1989582877. The reversal of 1989582864 is 4682859891.

It is a junction number, because it is equal to n+sod(n) for n = 1989582798 and 1989582807.

It is not an unprimeable number, because it can be changed into a prime (1989582863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177982 + ... + 188829.

Almost surely, 2^1989582864 is an apocalyptic number.

It is an amenable number.

1989582864 is an abundant number, since it is smaller than the sum of its proper divisors (3195671568).

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

1989582864 is a wasteful number, since it uses less digits than its factorization.

1989582864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366935 (or 366929 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 60.

The square root of 1989582864 is about 44604.7403758838. The cubic root of 1989582864 is about 1257.7297795320.

The spelling of 1989582864 in words is "one billion, nine hundred eighty-nine million, five hundred eighty-two thousand, eight hundred sixty-four".