981990577860 has 96 divisors (see below), whose sum is σ = 2774041869312. Its totient is φ = 259541692800.

The previous prime is 981990577853. The next prime is 981990577861. The reversal of 981990577860 is 68775099189.

It is not an unprimeable number, because it can be changed into a prime (981990577861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3891247 + ... + 4135913.

It is an arithmetic number, because the mean of its divisors is an integer number (28896269472).

Almost surely, 2^981990577860 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 981990577860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1387020934656).

981990577860 is an abundant number, since it is smaller than the sum of its proper divisors (1792051291452).

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

981990577860 is a wasteful number, since it uses less digits than its factorization.

981990577860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245273 (or 245271 counting only the distinct ones).

The product of its (nonzero) digits is 68584320, while the sum is 69.

The spelling of 981990577860 in words is "nine hundred eighty-one billion, nine hundred ninety million, five hundred seventy-seven thousand, eight hundred sixty".