42428557 has 4 divisors (see below), whose sum is σ = 42500700. Its totient is φ = 42356416.

The previous prime is 42428543. The next prime is 42428569. The reversal of 42428557 is 75582424.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14243076 + 28185481 = 3774^2 + 5309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42428557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42428527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35182 + ... + 36367.

It is an arithmetic number, because the mean of its divisors is an integer number (10625175).

Almost surely, 2^42428557 is an apocalyptic number.

It is an amenable number.

42428557 is a deficient number, since it is larger than the sum of its proper divisors (72143).

42428557 is an equidigital number, since it uses as much as digits as its factorization.

42428557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72142.

The product of its digits is 89600, while the sum is 37.

The square root of 42428557 is about 6513.7206725496. The cubic root of 42428557 is about 348.7809480807.

The spelling of 42428557 in words is "forty-two million, four hundred twenty-eight thousand, five hundred fifty-seven".