28683637 has 4 divisors (see below), whose sum is σ = 28785996. Its totient is φ = 28581280.

The previous prime is 28683601. The next prime is 28683659. The reversal of 28683637 is 73638682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22363441 + 6320196 = 4729^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 28683637 - 2¹¹ = 28681589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28683593 and 28683602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28683937) 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, 50758 + ... + 51319.

It is an arithmetic number, because the mean of its divisors is an integer number (7196499).

Almost surely, 2^28683637 is an apocalyptic number.

It is an amenable number.

28683637 is a deficient number, since it is larger than the sum of its proper divisors (102359).

28683637 is a wasteful number, since it uses less digits than its factorization.

28683637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102358.

The product of its digits is 290304, while the sum is 43.

The square root of 28683637 is about 5355.7106904686. The cubic root of 28683637 is about 306.1103913441.

The spelling of 28683637 in words is "twenty-eight million, six hundred eighty-three thousand, six hundred thirty-seven".