1981007880 has 64 divisors (see below), whose sum is σ = 6134745600. Its totient is φ = 511226880.

The previous prime is 1981007801. The next prime is 1981007891. The reversal of 1981007880 is 887001891.

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, 262545 + ... + 269984.

It is an arithmetic number, because the mean of its divisors is an integer number (95855400).

Almost surely, 2^1981007880 is an apocalyptic number.

1981007880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1981007880 is an abundant number, since it is smaller than the sum of its proper divisors (4153737720).

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

1981007880 is a wasteful number, since it uses less digits than its factorization.

1981007880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532574 (or 532570 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 1981007880 is about 44508.5146910117. The cubic root of 1981007880 is about 1255.9202638469.

The spelling of 1981007880 in words is "one billion, nine hundred eighty-one million, seven thousand, eight hundred eighty".