1978678485788 has 6 divisors (see below), whose sum is σ = 3462687350136. Its totient is φ = 989339242892.

The previous prime is 1978678485737. The next prime is 1978678485821. The reversal of 1978678485788 is 8875848768791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247334810720 + ... + 247334810727.

It is an arithmetic number, because the mean of its divisors is an integer number (577114558356).

Almost surely, 2^{1978678485788} is an apocalyptic number.

It is an amenable number.

1978678485788 is a deficient number, since it is larger than the sum of its proper divisors (1484008864348).

1978678485788 is a wasteful number, since it uses less digits than its factorization.

1978678485788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494669621451 (or 494669621449 counting only the distinct ones).

The product of its digits is 12138577920, while the sum is 86.

The spelling of 1978678485788 in words is "one trillion, nine hundred seventy-eight billion, six hundred seventy-eight million, four hundred eighty-five thousand, seven hundred eighty-eight".