42428172 has 24 divisors (see below), whose sum is σ = 99963136. Its totient is φ = 14005008.

The previous prime is 42428161. The next prime is 42428173. The reversal of 42428172 is 27182424.

It is a super-3 number, since 3×42428172³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (30) 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 (42428173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15928 + ... + 18399.

Almost surely, 2^42428172 is an apocalyptic number.

It is an amenable number.

42428172 is an abundant number, since it is smaller than the sum of its proper divisors (57534964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42428172 is a wasteful number, since it uses less digits than its factorization.

42428172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34437 (or 34435 counting only the distinct ones).

The product of its digits is 7168, while the sum is 30.

The square root of 42428172 is about 6513.6911194806. The cubic root of 42428172 is about 348.7798931224.

The spelling of 42428172 in words is "forty-two million, four hundred twenty-eight thousand, one hundred seventy-two".