981280660 has 24 divisors (see below), whose sum is σ = 2091448800. Its totient is φ = 386653344.

The previous prime is 981280639. The next prime is 981280661. The reversal of 981280660 is 66082189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981280661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364810 + ... + 367489.

It is an arithmetic number, because the mean of its divisors is an integer number (87143700).

Almost surely, 2^981280660 is an apocalyptic number.

It is an amenable number.

981280660 is an abundant number, since it is smaller than the sum of its proper divisors (1110168140).

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

981280660 is a wasteful number, since it uses less digits than its factorization.

981280660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732375 (or 732373 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 981280660 is about 31325.3995984090. The cubic root of 981280660 is about 993.7208751139.

The spelling of 981280660 in words is "nine hundred eighty-one million, two hundred eighty thousand, six hundred sixty".