1989772080 has 80 divisors (see below), whose sum is σ = 6174247680. Its totient is φ = 530093824.

The previous prime is 1989772049. The next prime is 1989772087. The reversal of 1989772080 is 802779891.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1989772087) 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, 290131 + ... + 296909.

It is an arithmetic number, because the mean of its divisors is an integer number (77178096).

Almost surely, 2^1989772080 is an apocalyptic number.

1989772080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989772080 is an abundant number, since it is smaller than the sum of its proper divisors (4184475600).

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

1989772080 is a wasteful number, since it uses less digits than its factorization.

1989772080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8018 (or 8012 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 51.

The square root of 1989772080 is about 44606.8613556255. The cubic root of 1989772080 is about 1257.7696497075.

The spelling of 1989772080 in words is "one billion, nine hundred eighty-nine million, seven hundred seventy-two thousand, eighty".