78639861012 has 12 divisors (see below), whose sum is σ = 183493009056. Its totient is φ = 26213287000.

The previous prime is 78639860987. The next prime is 78639861037. The reversal of 78639861012 is 21016893687.

It is an interprime number because it is at equal distance from previous prime (78639860987) and next prime (78639861037).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3276660864 + ... + 3276660887.

It is an arithmetic number, because the mean of its divisors is an integer number (15291084088).

Almost surely, 2^78639861012 is an apocalyptic number.

It is an amenable number.

78639861012 is an abundant number, since it is smaller than the sum of its proper divisors (104853148044).

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

78639861012 is a wasteful number, since it uses less digits than its factorization.

78639861012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6553321758 (or 6553321756 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 78639861012 in words is "seventy-eight billion, six hundred thirty-nine million, eight hundred sixty-one thousand, twelve".