1980776980 has 240 divisors, whose sum is σ = 5533879680. Its totient is φ = 590333184.

The previous prime is 1980776971. The next prime is 1980777011. The reversal of 1980776980 is 896770891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11860857 + ... + 11861023.

It is an arithmetic number, because the mean of its divisors is an integer number (23057832).

Almost surely, 2^1980776980 is an apocalyptic number.

1980776980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980776980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2766939840).

1980776980 is an abundant number, since it is smaller than the sum of its proper divisors (3553102700).

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

1980776980 is a wasteful number, since it uses less digits than its factorization.

1980776980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 1980776980 is about 44505.9207297186. The cubic root of 1980776980 is about 1255.8714665892.

The spelling of 1980776980 in words is "one billion, nine hundred eighty million, seven hundred seventy-six thousand, nine hundred eighty".