1981057080 has 32 divisors (see below), whose sum is σ = 5943171600. Its totient is φ = 528281856.

The previous prime is 1981057079. The next prime is 1981057129. The reversal of 1981057080 is 807501891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8254285 + ... + 8254524.

Almost surely, 2^1981057080 is an apocalyptic number.

1981057080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1981057080 is an abundant number, since it is smaller than the sum of its proper divisors (3962114520).

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

1981057080 is a wasteful number, since it uses less digits than its factorization.

1981057080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16508823 (or 16508819 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 1981057080 is about 44509.0673908138. The cubic root of 1981057080 is about 1255.9306610402.

The spelling of 1981057080 in words is "one billion, nine hundred eighty-one million, fifty-seven thousand, eighty".