1978444580440 has 64 divisors (see below), whose sum is σ = 4555376179200. Its totient is φ = 772913860992.

The previous prime is 1978444580417. The next prime is 1978444580479. The reversal of 1978444580440 is 440854448791.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26931199 + ... + 27004561.

It is an arithmetic number, because the mean of its divisors is an integer number (71177752800).

Almost surely, 2^{1978444580440} is an apocalyptic number.

1978444580440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978444580440 is an abundant number, since it is smaller than the sum of its proper divisors (2576931598760).

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

1978444580440 is a wasteful number, since it uses less digits than its factorization.

1978444580440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89096 (or 89092 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 58.

The spelling of 1978444580440 in words is "one trillion, nine hundred seventy-eight billion, four hundred forty-four million, five hundred eighty thousand, four hundred forty".