42781256 has 32 divisors (see below), whose sum is σ = 92576640. Its totient is φ = 18154368.

The previous prime is 42781243. The next prime is 42781267. The reversal of 42781256 is 65218724.

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, 2060 + ... + 9476.

It is an arithmetic number, because the mean of its divisors is an integer number (2893020).

Almost surely, 2^42781256 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 42781256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46288320).

42781256 is an abundant number, since it is smaller than the sum of its proper divisors (49795384).

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

42781256 is a wasteful number, since it uses less digits than its factorization.

42781256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7533 (or 7529 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 42781256 is about 6540.7381846394. The cubic root of 42781256 is about 349.7447281489.

The spelling of 42781256 in words is "forty-two million, seven hundred eighty-one thousand, two hundred fifty-six".