66294428 has 12 divisors (see below), whose sum is σ = 116079432. Its totient is φ = 33128880.

The previous prime is 66294427. The next prime is 66294451. The reversal of 66294428 is 82449266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66294427) 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, 6563 + ... + 13253.

It is an arithmetic number, because the mean of its divisors is an integer number (9673286).

Almost surely, 2^66294428 is an apocalyptic number.

It is an amenable number.

66294428 is a deficient number, since it is larger than the sum of its proper divisors (49785004).

66294428 is a wasteful number, since it uses less digits than its factorization.

66294428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9172 (or 9170 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 66294428 is about 8142.1390309918. The cubic root of 66294428 is about 404.7240471448.

The spelling of 66294428 in words is "sixty-six million, two hundred ninety-four thousand, four hundred twenty-eight".