64278668 has 12 divisors (see below), whose sum is σ = 112625520. Its totient is φ = 32099952.

The previous prime is 64278647. The next prime is 64278673. The reversal of 64278668 is 86687246.

64278668 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

64278668 is strictly pandigital in base 9.

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, 6008 + ... + 12831.

It is an arithmetic number, because the mean of its divisors is an integer number (9385460).

Almost surely, 2^64278668 is an apocalyptic number.

It is an amenable number.

64278668 is a deficient number, since it is larger than the sum of its proper divisors (48346852).

64278668 is a wasteful number, since it uses less digits than its factorization.

64278668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19696 (or 19694 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 64278668 is about 8017.3978322146. The cubic root of 64278668 is about 400.5797177458.

It can be divided in two parts, 64278 and 668, that added together give a palindrome (64946).

The spelling of 64278668 in words is "sixty-four million, two hundred seventy-eight thousand, six hundred sixty-eight".