42856728 has 64 divisors (see below), whose sum is σ = 118402560. Its totient is φ = 12857856.

The previous prime is 42856727. The next prime is 42856741. The reversal of 42856728 is 82765824.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 42856728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42856727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7101 + ... + 11667.

It is an arithmetic number, because the mean of its divisors is an integer number (1850040).

Almost surely, 2^42856728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42856728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59201280).

42856728 is an abundant number, since it is smaller than the sum of its proper divisors (75545832).

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

42856728 is a wasteful number, since it uses less digits than its factorization.

42856728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4616 (or 4612 counting only the distinct ones).

The product of its digits is 215040, while the sum is 42.

The square root of 42856728 is about 6546.5050217654. The cubic root of 42856728 is about 349.9502732074.

The spelling of 42856728 in words is "forty-two million, eight hundred fifty-six thousand, seven hundred twenty-eight".