66724288 has 28 divisors (see below), whose sum is σ = 138165840. Its totient is φ = 31910912.

The previous prime is 66724277. The next prime is 66724289. The reversal of 66724288 is 88242766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66724289) 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, 21193 + ... + 24136.

Almost surely, 2^66724288 is an apocalyptic number.

It is an amenable number.

66724288 is an abundant number, since it is smaller than the sum of its proper divisors (71441552).

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

66724288 is a wasteful number, since it uses less digits than its factorization.

66724288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45364 (or 45354 counting only the distinct ones).

The product of its digits is 258048, while the sum is 43.

The square root of 66724288 is about 8168.4936187770. The cubic root of 66724288 is about 405.5969209268.

The spelling of 66724288 in words is "sixty-six million, seven hundred twenty-four thousand, two hundred eighty-eight".