78684272 has 20 divisors (see below), whose sum is σ = 152598120. Its totient is φ = 39304128.

The previous prime is 78684257. The next prime is 78684299. The reversal of 78684272 is 27248687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22754 + ... + 25982.

It is an arithmetic number, because the mean of its divisors is an integer number (7629906).

Almost surely, 2^78684272 is an apocalyptic number.

It is an amenable number.

78684272 is a deficient number, since it is larger than the sum of its proper divisors (73913848).

78684272 is a wasteful number, since it uses less digits than its factorization.

78684272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4760 (or 4754 counting only the distinct ones).

The product of its digits is 301056, while the sum is 44.

The square root of 78684272 is about 8870.4155483269. The cubic root of 78684272 is about 428.5116598978.

It can be divided in two parts, 786 and 84272, that added together give a palindrome (85058).

The spelling of 78684272 in words is "seventy-eight million, six hundred eighty-four thousand, two hundred seventy-two".