42428866 has 4 divisors (see below), whose sum is σ = 63643302. Its totient is φ = 21214432.

The previous prime is 42428861. The next prime is 42428873. The reversal of 42428866 is 66882424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41873841 + 555025 = 6471^2 + 745^2 .

It is not an unprimeable number, because it can be changed into a prime (42428861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607215 + ... + 10607218.

Almost surely, 2^42428866 is an apocalyptic number.

42428866 is a deficient number, since it is larger than the sum of its proper divisors (21214436).

42428866 is a wasteful number, since it uses less digits than its factorization.

42428866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21214435.

The product of its digits is 147456, while the sum is 40.

The square root of 42428866 is about 6513.7443916690. The cubic root of 42428866 is about 348.7817947828.

The spelling of 42428866 in words is "forty-two million, four hundred twenty-eight thousand, eight hundred sixty-six".