78296139638 has 4 divisors (see below), whose sum is σ = 117444209460. Its totient is φ = 39148069818.

The previous prime is 78296139619. The next prime is 78296139659. The reversal of 78296139638 is 83693169287.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78296139638² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19574034908 + ... + 19574034911.

It is an arithmetic number, because the mean of its divisors is an integer number (29361052365).

Almost surely, 2^78296139638 is an apocalyptic number.

78296139638 is a deficient number, since it is larger than the sum of its proper divisors (39148069822).

78296139638 is a wasteful number, since it uses less digits than its factorization.

78296139638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39148069821.

The product of its digits is 23514624, while the sum is 62.

The spelling of 78296139638 in words is "seventy-eight billion, two hundred ninety-six million, one hundred thirty-nine thousand, six hundred thirty-eight".