78102428664 has 128 divisors (see below), whose sum is σ = 220999564800. Its totient is φ = 22821004800.

The previous prime is 78102428639. The next prime is 78102428683. The reversal of 78102428664 is 46682420187.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 958314 + ... + 1036614.

It is an arithmetic number, because the mean of its divisors is an integer number (1726559100).

Almost surely, 2^78102428664 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 78102428664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110499782400).

78102428664 is an abundant number, since it is smaller than the sum of its proper divisors (142897136136).

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

78102428664 is a wasteful number, since it uses less digits than its factorization.

78102428664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78485 (or 78481 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 78102428664 in words is "seventy-eight billion, one hundred two million, four hundred twenty-eight thousand, six hundred sixty-four".