66428768 has 24 divisors (see below), whose sum is σ = 149465232. Its totient is φ = 28469376.

The previous prime is 66428767. The next prime is 66428771. The reversal of 66428768 is 86782466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66428767) 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, 148055 + ... + 148502.

It is an arithmetic number, because the mean of its divisors is an integer number (6227718).

Almost surely, 2^66428768 is an apocalyptic number.

It is an amenable number.

66428768 is an abundant number, since it is smaller than the sum of its proper divisors (83036464).

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

66428768 is a wasteful number, since it uses less digits than its factorization.

66428768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296574 (or 296566 counting only the distinct ones).

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

The square root of 66428768 is about 8150.3845308059. The cubic root of 66428768 is about 404.9972422715.

The spelling of 66428768 in words is "sixty-six million, four hundred twenty-eight thousand, seven hundred sixty-eight".