5628781 has 4 divisors (see below), whose sum is σ = 5634364. Its totient is φ = 5623200.

The previous prime is 5628757. The next prime is 5628793. The reversal of 5628781 is 1878265.

5628781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5336100 + 292681 = 2310^2 + 541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5628781 is a prime.

It is a super-2 number, since 2×5628781² = 63366351091922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5628781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5628281) 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, 810 + ... + 3451.

It is an arithmetic number, because the mean of its divisors is an integer number (1408591).

Almost surely, 2^5628781 is an apocalyptic number.

It is an amenable number.

5628781 is a deficient number, since it is larger than the sum of its proper divisors (5583).

5628781 is a wasteful number, since it uses less digits than its factorization.

5628781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582.

The product of its digits is 26880, while the sum is 37.

The square root of 5628781 is about 2372.5052160111. The cubic root of 5628781 is about 177.8845040435.

The spelling of 5628781 in words is "five million, six hundred twenty-eight thousand, seven hundred eighty-one".