28768538 has 16 divisors (see below), whose sum is σ = 45541440. Its totient is φ = 13602336.

The previous prime is 28768529. The next prime is 28768541. The reversal of 28768538 is 83586782.

It is a junction number, because it is equal to n+sod(n) for n = 28768492 and 28768501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 581 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (2846340).

Almost surely, 2^28768538 is an apocalyptic number.

28768538 is a deficient number, since it is larger than the sum of its proper divisors (16772902).

28768538 is a wasteful number, since it uses less digits than its factorization.

28768538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7141.

The product of its digits is 645120, while the sum is 47.

The square root of 28768538 is about 5363.6310462223. The cubic root of 28768538 is about 306.4121136423.

The spelling of 28768538 in words is "twenty-eight million, seven hundred sixty-eight thousand, five hundred thirty-eight".