42609728 has 28 divisors (see below), whose sum is σ = 96633792. Its totient is φ = 18261120.

The previous prime is 42609709. The next prime is 42609737. The reversal of 42609728 is 82790624.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 42609691 and 42609700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47108 + ... + 48003.

Almost surely, 2^42609728 is an apocalyptic number.

It is an amenable number.

42609728 is an abundant number, since it is smaller than the sum of its proper divisors (54024064).

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

42609728 is an equidigital number, since it uses as much as digits as its factorization.

42609728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95130 (or 95120 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 42609728 is about 6527.6127336110. The cubic root of 42609728 is about 349.2766776147.

The spelling of 42609728 in words is "forty-two million, six hundred nine thousand, seven hundred twenty-eight".