42782557 has 8 divisors (see below), whose sum is σ = 46404792. Its totient is φ = 39283200.

The previous prime is 42782543. The next prime is 42782563. The reversal of 42782557 is 75528724.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 89401 + 42693156 = 299^2 + 6534^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42782557 - 2¹⁵ = 42749789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42782527) 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, 29994 + ... + 31387.

It is an arithmetic number, because the mean of its divisors is an integer number (5800599).

Almost surely, 2^42782557 is an apocalyptic number.

It is an amenable number.

42782557 is a deficient number, since it is larger than the sum of its proper divisors (3622235).

42782557 is a wasteful number, since it uses less digits than its factorization.

42782557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61439.

The product of its digits is 156800, while the sum is 40.

The square root of 42782557 is about 6540.8376374896. The cubic root of 42782557 is about 349.7482734187.

The spelling of 42782557 in words is "forty-two million, seven hundred eighty-two thousand, five hundred fifty-seven".