66639528 has 48 divisors (see below), whose sum is σ = 181428000. Its totient is φ = 22096800.

The previous prime is 66639527. The next prime is 66639539. The reversal of 66639528 is 82593666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66639523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12003 + ... + 16653.

It is an arithmetic number, because the mean of its divisors is an integer number (3779750).

Almost surely, 2^66639528 is an apocalyptic number.

It is an amenable number.

66639528 is an abundant number, since it is smaller than the sum of its proper divisors (114788472).

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

66639528 is a wasteful number, since it uses less digits than its factorization.

66639528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4862 (or 4855 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 66639528 is about 8163.3037429707. The cubic root of 66639528 is about 405.4251046197.

The spelling of 66639528 in words is "sixty-six million, six hundred thirty-nine thousand, five hundred twenty-eight".