78368872642 has 4 divisors (see below), whose sum is σ = 117553308966. Its totient is φ = 39184436320.

The previous prime is 78368872627. The next prime is 78368872691. The reversal of 78368872642 is 24627886387.

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

It can be written as a sum of positive squares in only one way, i.e., 52601881201 + 25766991441 = 229351^2 + 160521^2 .

It is a super-2 number, since 2×78368872642² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19592218159 + ... + 19592218162.

Almost surely, 2^78368872642 is an apocalyptic number.

78368872642 is a deficient number, since it is larger than the sum of its proper divisors (39184436324).

78368872642 is a wasteful number, since it uses less digits than its factorization.

78368872642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39184436323.

The product of its digits is 43352064, while the sum is 61.

The spelling of 78368872642 in words is "seventy-eight billion, three hundred sixty-eight million, eight hundred seventy-two thousand, six hundred forty-two".