78739346787 has 4 divisors (see below), whose sum is σ = 104985795720. Its totient is φ = 52492897856.

The previous prime is 78739346773. The next prime is 78739346857. The reversal of 78739346787 is 78764393787.

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

It is a cyclic number.

It is not a de Polignac number, because 78739346787 - 2¹⁴ = 78739330403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78739346747) 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, 13123224462 + ... + 13123224467.

It is an arithmetic number, because the mean of its divisors is an integer number (26246448930).

Almost surely, 2^78739346787 is an apocalyptic number.

78739346787 is a deficient number, since it is larger than the sum of its proper divisors (26246448933).

78739346787 is a wasteful number, since it uses less digits than its factorization.

78739346787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26246448932.

The product of its digits is 298722816, while the sum is 69.

The spelling of 78739346787 in words is "seventy-eight billion, seven hundred thirty-nine million, three hundred forty-six thousand, seven hundred eighty-seven".