42428618 has 4 divisors (see below), whose sum is σ = 63642930. Its totient is φ = 21214308.

The previous prime is 42428599. The next prime is 42428647. The reversal of 42428618 is 81682424.

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., 40157569 + 2271049 = 6337^2 + 1507^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607153 + ... + 10607156.

Almost surely, 2^42428618 is an apocalyptic number.

42428618 is a deficient number, since it is larger than the sum of its proper divisors (21214312).

42428618 is a wasteful number, since it uses less digits than its factorization.

42428618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21214311.

The product of its digits is 24576, while the sum is 35.

The square root of 42428618 is about 6513.7253549716. The cubic root of 42428618 is about 348.7811152293.

The spelling of 42428618 in words is "forty-two million, four hundred twenty-eight thousand, six hundred eighteen".