78639365 has 48 divisors (see below), whose sum is σ = 118195200. Its totient is φ = 49900032.

The previous prime is 78639361. The next prime is 78639391. The reversal of 78639365 is 56393687.

It is not a de Polignac number, because 78639365 - 2² = 78639361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78639361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 328916 + ... + 329154.

It is an arithmetic number, because the mean of its divisors is an integer number (2462400).

Almost surely, 2^78639365 is an apocalyptic number.

It is an amenable number.

78639365 is a deficient number, since it is larger than the sum of its proper divisors (39555835).

78639365 is a wasteful number, since it uses less digits than its factorization.

78639365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 347 counting only the distinct ones).

The product of its digits is 816480, while the sum is 47.

The square root of 78639365 is about 8867.8839076749. The cubic root of 78639365 is about 428.4301237593.

The spelling of 78639365 in words is "seventy-eight million, six hundred thirty-nine thousand, three hundred sixty-five".