42728540 has 24 divisors (see below), whose sum is σ = 92625792. Its totient is φ = 16539840.

The previous prime is 42728537. The next prime is 42728561. The reversal of 42728540 is 4582724.

It is a junction number, because it is equal to n+sod(n) for n = 42728497 and 42728506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33839 + ... + 35078.

It is an arithmetic number, because the mean of its divisors is an integer number (3859408).

Almost surely, 2^42728540 is an apocalyptic number.

It is an amenable number.

42728540 is an abundant number, since it is smaller than the sum of its proper divisors (49897252).

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

42728540 is a wasteful number, since it uses less digits than its factorization.

42728540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68957 (or 68955 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 42728540 is about 6536.7071220914. The cubic root of 42728540 is about 349.6010147342.

The spelling of 42728540 in words is "forty-two million, seven hundred twenty-eight thousand, five hundred forty".