78316978742 has 4 divisors (see below), whose sum is σ = 117475468116. Its totient is φ = 39158489370.

The previous prime is 78316978711. The next prime is 78316978757. The reversal of 78316978742 is 24787961387.

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

It is a super-2 number, since 2×78316978742² (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, 19579244684 + ... + 19579244687.

It is an arithmetic number, because the mean of its divisors is an integer number (29368867029).

Almost surely, 2^78316978742 is an apocalyptic number.

78316978742 is a deficient number, since it is larger than the sum of its proper divisors (39158489374).

78316978742 is a wasteful number, since it uses less digits than its factorization.

78316978742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39158489373.

The product of its digits is 28449792, while the sum is 62.

The spelling of 78316978742 in words is "seventy-eight billion, three hundred sixteen million, nine hundred seventy-eight thousand, seven hundred forty-two".