28685736 has 48 divisors (see below), whose sum is σ = 78062400. Its totient is φ = 9516192.

The previous prime is 28685731. The next prime is 28685743. The reversal of 28685736 is 63758682.

28685736 = 10² + 11² + ... + 441².

It is a junction number, because it is equal to n+sod(n) for n = 28685691 and 28685700.

It is not an unprimeable number, because it can be changed into a prime (28685731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16375 + ... + 18041.

It is an arithmetic number, because the mean of its divisors is an integer number (1626300).

Almost surely, 2^28685736 is an apocalyptic number.

It is an amenable number.

28685736 is an abundant number, since it is smaller than the sum of its proper divisors (49376664).

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

28685736 is a wasteful number, since it uses less digits than its factorization.

28685736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918 (or 1911 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28685736 is about 5355.9066459377. The cubic root of 28685736 is about 306.1178579709.

The spelling of 28685736 in words is "twenty-eight million, six hundred eighty-five thousand, seven hundred thirty-six".