78864668 has 24 divisors (see below), whose sum is σ = 145563600. Its totient is φ = 37283328.

The previous prime is 78864647. The next prime is 78864697. The reversal of 78864668 is 86646887.

It is a happy number.

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, 70046 + ... + 71162.

It is an arithmetic number, because the mean of its divisors is an integer number (6065150).

Almost surely, 2^78864668 is an apocalyptic number.

It is an amenable number.

78864668 is a deficient number, since it is larger than the sum of its proper divisors (66698932).

78864668 is a wasteful number, since it uses less digits than its factorization.

78864668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069 (or 2067 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 53.

The square root of 78864668 is about 8880.5781343334. The cubic root of 78864668 is about 428.8388866192.

It can be divided in two parts, 788 and 64668, that added together give a palindrome (65456).

The spelling of 78864668 in words is "seventy-eight million, eight hundred sixty-four thousand, six hundred sixty-eight".