66968228 has 24 divisors (see below), whose sum is σ = 119087640. Its totient is φ = 32947200.

The previous prime is 66968227. The next prime is 66968233. The reversal of 66968228 is 82286966.

It can be written as a sum of positive squares in 4 ways, for example, as 252004 + 66716224 = 502^2 + 8168^2 .

It is a super-2 number, since 2×66968228² = 8969487122919968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66968227) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 111128 + ... + 111728.

It is an arithmetic number, because the mean of its divisors is an integer number (4961985).

Almost surely, 2^66968228 is an apocalyptic number.

It is an amenable number.

66968228 is a deficient number, since it is larger than the sum of its proper divisors (52119412).

66968228 is a wasteful number, since it uses less digits than its factorization.

66968228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007 (or 1005 counting only the distinct ones).

The product of its digits is 497664, while the sum is 47.

The square root of 66968228 is about 8183.4117579406. The cubic root of 66968228 is about 406.0905991443.

The spelling of 66968228 in words is "sixty-six million, nine hundred sixty-eight thousand, two hundred twenty-eight".