1989822660 has 96 divisors (see below), whose sum is σ = 6522792192. Its totient is φ = 443719680.

The previous prime is 1989822643. The next prime is 1989822689. The reversal of 1989822660 is 662289891.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40557 + ... + 74996.

It is an arithmetic number, because the mean of its divisors is an integer number (67945752).

Almost surely, 2^1989822660 is an apocalyptic number.

1989822660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989822660 is an abundant number, since it is smaller than the sum of its proper divisors (4532969532).

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

1989822660 is a wasteful number, since it uses less digits than its factorization.

1989822660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115613 (or 115611 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 1989822660 is about 44607.4283051601. The cubic root of 1989822660 is about 1257.7803071174.

The spelling of 1989822660 in words is "one billion, nine hundred eighty-nine million, eight hundred twenty-two thousand, six hundred sixty".