78425688636 has 36 divisors (see below), whose sum is σ = 198303105000. Its totient is φ = 26133932448.

The previous prime is 78425688629. The next prime is 78425688683. The reversal of 78425688636 is 63688652487.

78425688636 is a `hidden beast` number, since 7 + 8 + 4 + 2 + 568 + 8 + 63 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211411 + ... + 448938.

Almost surely, 2^78425688636 is an apocalyptic number.

It is an amenable number.

78425688636 is an abundant number, since it is smaller than the sum of its proper divisors (119877416364).

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

78425688636 is a wasteful number, since it uses less digits than its factorization.

78425688636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663658 (or 663653 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 63.

It can be divided in two parts, 7842568 and 8636, that added together give a square (7851204 = 2802²).

The spelling of 78425688636 in words is "seventy-eight billion, four hundred twenty-five million, six hundred eighty-eight thousand, six hundred thirty-six".