1000981879020 has 144 divisors (see below), whose sum is σ = 3048310032768. Its totient is φ = 265875517440.

The previous prime is 1000981878997. The next prime is 1000981879031. The reversal of 1000981879020 is 209781890001.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56604580 + ... + 56622260.

It is an arithmetic number, because the mean of its divisors is an integer number (21168819672).

Almost surely, 2^{1000981879020} is an apocalyptic number.

1000981879020 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 1000981879020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524155016384).

1000981879020 is an abundant number, since it is smaller than the sum of its proper divisors (2047328153748).

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

1000981879020 is a wasteful number, since it uses less digits than its factorization.

1000981879020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18920 (or 18915 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The spelling of 1000981879020 in words is "one trillion, nine hundred eighty-one million, eight hundred seventy-nine thousand, twenty".