78247357638 has 8 divisors (see below), whose sum is σ = 156494715288. Its totient is φ = 26082452544.

The previous prime is 78247357637. The next prime is 78247357651. The reversal of 78247357638 is 83675374287.

It is a sphenic number, since it is the product of 3 distinct primes.

78247357638 is an admirable number.

It is a super-2 number, since 2×78247357638² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78247357633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6520613131 + ... + 6520613142.

It is an arithmetic number, because the mean of its divisors is an integer number (19561839411).

Almost surely, 2^78247357638 is an apocalyptic number.

78247357638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78247357638 is a wasteful number, since it uses less digits than its factorization.

78247357638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13041226278.

The product of its digits is 47416320, while the sum is 60.

The spelling of 78247357638 in words is "seventy-eight billion, two hundred forty-seven million, three hundred fifty-seven thousand, six hundred thirty-eight".