66038728 has 16 divisors (see below), whose sum is σ = 141511680. Its totient is φ = 28302288.

The previous prime is 66038683. The next prime is 66038767. The reversal of 66038728 is 82783066.

It is a happy number.

It is a super-2 number, since 2×66038728² = 8722227191715968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589576 + ... + 589687.

It is an arithmetic number, because the mean of its divisors is an integer number (8844480).

Almost surely, 2^66038728 is an apocalyptic number.

It is an amenable number.

66038728 is an abundant number, since it is smaller than the sum of its proper divisors (75472952).

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

66038728 is a wasteful number, since it uses less digits than its factorization.

66038728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179276 (or 1179272 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 66038728 is about 8126.4215987112. The cubic root of 66038728 is about 404.2030316283.

It can be divided in two parts, 66038 and 728, that added together give a palindrome (66766).

The spelling of 66038728 in words is "sixty-six million, thirty-eight thousand, seven hundred twenty-eight".