42808784 has 20 divisors (see below), whose sum is σ = 83103684. Its totient is φ = 21362688.

The previous prime is 42808781. The next prime is 42808823. The reversal of 42808784 is 48780824.

It can be written as a sum of positive squares in 2 ways, for example, as 30558784 + 12250000 = 5528^2 + 3500^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42808781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6914 + ... + 11550.

Almost surely, 2^42808784 is an apocalyptic number.

It is an amenable number.

42808784 is a deficient number, since it is larger than the sum of its proper divisors (40294900).

42808784 is a wasteful number, since it uses less digits than its factorization.

42808784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5222 (or 5216 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 42808784 is about 6542.8421958656. The cubic root of 42808784 is about 349.8197275723.

The spelling of 42808784 in words is "forty-two million, eight hundred eight thousand, seven hundred eighty-four".