1978862342856 has 256 divisors, whose sum is σ = 5984346009600. Its totient is φ = 532680883200.

The previous prime is 1978862342833. The next prime is 1978862342881. The reversal of 1978862342856 is 6582432688791.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 505971541 + ... + 505975451.

It is an arithmetic number, because the mean of its divisors is an integer number (23376351600).

Almost surely, 2^{1978862342856} 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 1978862342856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2992173004800).

1978862342856 is an abundant number, since it is smaller than the sum of its proper divisors (4005483666744).

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

1978862342856 is a wasteful number, since it uses less digits than its factorization.

1978862342856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780 (or 4776 counting only the distinct ones).

The product of its digits is 278691840, while the sum is 69.

The spelling of 1978862342856 in words is "one trillion, nine hundred seventy-eight billion, eight hundred sixty-two million, three hundred forty-two thousand, eight hundred fifty-six".