66751828 has 54 divisors (see below), whose sum is σ = 139633242. Its totient is φ = 27735840.

The previous prime is 66751801. The next prime is 66751829. The reversal of 66751828 is 82815766.

It can be written as a sum of positive squares in only one way, i.e., 46212804 + 20539024 = 6798^2 + 4532^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66751829) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 648025 + ... + 648127.

Almost surely, 2^66751828 is an apocalyptic number.

It is an amenable number.

66751828 is an abundant number, since it is smaller than the sum of its proper divisors (72881414).

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

66751828 is a wasteful number, since it uses less digits than its factorization.

66751828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 129 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 66751828 is about 8170.1791902014. The cubic root of 66751828 is about 405.6527157161.

The spelling of 66751828 in words is "sixty-six million, seven hundred fifty-one thousand, eight hundred twenty-eight".