7894778390612 has 6 divisors (see below), whose sum is σ = 13815862183578. Its totient is φ = 3947389195304.

The previous prime is 7894778390557. The next prime is 7894778390633. The reversal of 7894778390612 is 2160938774987.

It can be written as a sum of positive squares in only one way, i.e., 7840873624336 + 53904766276 = 2800156^2 + 232174^2 .

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, 986847298823 + ... + 986847298830.

It is an arithmetic number, because the mean of its divisors is an integer number (2302643697263).

Almost surely, 2^{7894778390612} is an apocalyptic number.

It is an amenable number.

7894778390612 is a deficient number, since it is larger than the sum of its proper divisors (5921083792966).

7894778390612 is a wasteful number, since it uses less digits than its factorization.

7894778390612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973694597657 (or 1973694597655 counting only the distinct ones).

The product of its (nonzero) digits is 256048128, while the sum is 71.

The spelling of 7894778390612 in words is "seven trillion, eight hundred ninety-four billion, seven hundred seventy-eight million, three hundred ninety thousand, six hundred twelve".