78717977739 has 16 divisors (see below), whose sum is σ = 118819591200. Its totient is φ = 51488487648.

The previous prime is 78717977731. The next prime is 78717977753. The reversal of 78717977739 is 93777971787.

It is not a de Polignac number, because 78717977739 - 2³ = 78717977731 is a prime.

It is a super-3 number, since 3×78717977739³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (78717977731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27503104 + ... + 27505965.

It is an arithmetic number, because the mean of its divisors is an integer number (7426224450).

Almost surely, 2^78717977739 is an apocalyptic number.

78717977739 is a deficient number, since it is larger than the sum of its proper divisors (40101613461).

78717977739 is a wasteful number, since it uses less digits than its factorization.

78717977739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55009131 (or 55009125 counting only the distinct ones).

The product of its digits is 228709656, while the sum is 72.

The spelling of 78717977739 in words is "seventy-eight billion, seven hundred seventeen million, nine hundred seventy-seven thousand, seven hundred thirty-nine".