78664355 has 72 divisors (see below), whose sum is σ = 128512656. Its totient is φ = 45696000.

The previous prime is 78664343. The next prime is 78664357. The reversal of 78664355 is 55346687.

It is a de Polignac number, because none of the positive numbers 2^k-78664355 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78664357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 778805 + ... + 778905.

It is an arithmetic number, because the mean of its divisors is an integer number (1784898).

Almost surely, 2^78664355 is an apocalyptic number.

78664355 is a deficient number, since it is larger than the sum of its proper divisors (49848301).

78664355 is a wasteful number, since it uses less digits than its factorization.

78664355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 141 counting only the distinct ones).

The product of its digits is 604800, while the sum is 44.

The square root of 78664355 is about 8869.2928128459. The cubic root of 78664355 is about 428.4755010962.

It can be divided in two parts, 7866 and 4355, that added together give a palindrome (12221).

The spelling of 78664355 in words is "seventy-eight million, six hundred sixty-four thousand, three hundred fifty-five".