42688428 has 24 divisors (see below), whose sum is σ = 105466032. Its totient is φ = 13392384.

The previous prime is 42688423. The next prime is 42688441. The reversal of 42688428 is 82488624.

It is a super-3 number, since 3×42688428³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 42688428.

It is not an unprimeable number, because it can be changed into a prime (42688423) 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, 104425 + ... + 104832.

It is an arithmetic number, because the mean of its divisors is an integer number (4394418).

Almost surely, 2^42688428 is an apocalyptic number.

It is an amenable number.

42688428 is an abundant number, since it is smaller than the sum of its proper divisors (62777604).

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

42688428 is a wasteful number, since it uses less digits than its factorization.

42688428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209281 (or 209279 counting only the distinct ones).

The product of its digits is 196608, while the sum is 42.

The square root of 42688428 is about 6533.6381901663. The cubic root of 42688428 is about 349.4915829091.

The spelling of 42688428 in words is "forty-two million, six hundred eighty-eight thousand, four hundred twenty-eight".