66423678 has 32 divisors (see below), whose sum is σ = 139449600. Its totient is φ = 21052416.

The previous prime is 66423671. The next prime is 66423683. The reversal of 66423678 is 87632466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66423671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23358 + ... + 26046.

It is an arithmetic number, because the mean of its divisors is an integer number (4357800).

Almost surely, 2^66423678 is an apocalyptic number.

66423678 is an abundant number, since it is smaller than the sum of its proper divisors (73025922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66423678 is a wasteful number, since it uses less digits than its factorization.

66423678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896.

The product of its digits is 290304, while the sum is 42.

The square root of 66423678 is about 8150.0722696182. The cubic root of 66423678 is about 404.9868979148.

It can be divided in two parts, 664 and 23678, that added together give a palindrome (24342).

The spelling of 66423678 in words is "sixty-six million, four hundred twenty-three thousand, six hundred seventy-eight".