78759939 has 24 divisors (see below), whose sum is σ = 109498368. Its totient is φ = 50349600.

The previous prime is 78759937. The next prime is 78759943. The reversal of 78759939 is 93995787.

It is not a de Polignac number, because 78759939 - 2¹ = 78759937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78759931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 521514 + ... + 521664.

It is an arithmetic number, because the mean of its divisors is an integer number (4562432).

Almost surely, 2^78759939 is an apocalyptic number.

78759939 is a deficient number, since it is larger than the sum of its proper divisors (30738429).

78759939 is a wasteful number, since it uses less digits than its factorization.

78759939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 318 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 57.

The square root of 78759939 is about 8874.6796561904. The cubic root of 78759939 is about 428.6489757929.

It can be divided in two parts, 787 and 59939, that added together give a triangular number (60726 = T₃₄₈).

The spelling of 78759939 in words is "seventy-eight million, seven hundred fifty-nine thousand, nine hundred thirty-nine".