1978638776774 has 32 divisors (see below), whose sum is σ = 3255608160000. Its totient is φ = 894431276640.

The previous prime is 1978638776767. The next prime is 1978638776797. The reversal of 1978638776774 is 4776778368791.

It is a super-2 number, since 2×1978638776774² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9081764 + ... + 9297080.

It is an arithmetic number, because the mean of its divisors is an integer number (101737755000).

Almost surely, 2^{1978638776774} is an apocalyptic number.

1978638776774 is a deficient number, since it is larger than the sum of its proper divisors (1276969383226).

1978638776774 is a wasteful number, since it uses less digits than its factorization.

1978638776774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217628.

The product of its digits is 4182119424, while the sum is 80.

The spelling of 1978638776774 in words is "one trillion, nine hundred seventy-eight billion, six hundred thirty-eight million, seven hundred seventy-six thousand, seven hundred seventy-four".