78851368638 has 24 divisors (see below), whose sum is σ = 195251008368. Its totient is φ = 22528962432.

The previous prime is 78851368613. The next prime is 78851368639. The reversal of 78851368638 is 83686315887.

78851368638 is a `hidden beast` number, since 7 + 8 + 8 + 513 + 6 + 86 + 38 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78851368639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312902131 + ... + 312902382.

It is an arithmetic number, because the mean of its divisors is an integer number (8135458682).

Almost surely, 2^78851368638 is an apocalyptic number.

78851368638 is an abundant number, since it is smaller than the sum of its proper divisors (116399639730).

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

78851368638 is a wasteful number, since it uses less digits than its factorization.

78851368638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625804528 (or 625804525 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 78851368638 in words is "seventy-eight billion, eight hundred fifty-one million, three hundred sixty-eight thousand, six hundred thirty-eight".