42428817 has 12 divisors (see below), whose sum is σ = 61860240. Its totient is φ = 28020888.

The previous prime is 42428807. The next prime is 42428833. The reversal of 42428817 is 71882424.

It is not a de Polignac number, because 42428817 - 2⁷ = 42428689 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (42428807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21067 + ... + 22992.

It is an arithmetic number, because the mean of its divisors is an integer number (5155020).

Almost surely, 2^42428817 is an apocalyptic number.

It is an amenable number.

42428817 is a deficient number, since it is larger than the sum of its proper divisors (19431423).

42428817 is a wasteful number, since it uses less digits than its factorization.

42428817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44172 (or 44169 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 42428817 is about 6513.7406303905. The cubic root of 42428817 is about 348.7816605164.

It can be divided in two parts, 424 and 28817, that added together give a square (29241 = 171²).

The spelling of 42428817 in words is "forty-two million, four hundred twenty-eight thousand, eight hundred seventeen".