64978678 has 8 divisors (see below), whose sum is σ = 97588080. Its totient is φ = 32449320.

The previous prime is 64978673. The next prime is 64978681. The reversal of 64978678 is 87687946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64978673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17938 + ... + 21253.

It is an arithmetic number, because the mean of its divisors is an integer number (12198510).

Almost surely, 2^64978678 is an apocalyptic number.

64978678 is a deficient number, since it is larger than the sum of its proper divisors (32609402).

64978678 is a wasteful number, since it uses less digits than its factorization.

64978678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40022.

The product of its digits is 4064256, while the sum is 55.

The square root of 64978678 is about 8060.9353055337. The cubic root of 64978678 is about 402.0286069921.

It can be divided in two parts, 64978 and 678, that added together give a palindrome (65656).

The spelling of 64978678 in words is "sixty-four million, nine hundred seventy-eight thousand, six hundred seventy-eight".