78939786502 has 16 divisors (see below), whose sum is σ = 121184864640. Its totient is φ = 38551511232.

The previous prime is 78939786479. The next prime is 78939786529. The reversal of 78939786502 is 20568793987.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1646127 + ... + 1693402.

It is an arithmetic number, because the mean of its divisors is an integer number (7574054040).

Almost surely, 2^78939786502 is an apocalyptic number.

78939786502 is a deficient number, since it is larger than the sum of its proper divisors (42245078138).

78939786502 is a wasteful number, since it uses less digits than its factorization.

78939786502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3339807.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 78939786502 in words is "seventy-eight billion, nine hundred thirty-nine million, seven hundred eighty-six thousand, five hundred two".