28505716 has 6 divisors (see below), whose sum is σ = 49885010. Its totient is φ = 14252856.

The previous prime is 28505699. The next prime is 28505723. The reversal of 28505716 is 61750582.

28505716 is nontrivially palindromic in base 13.

It can be written as a sum of positive squares in only one way, i.e., 19324816 + 9180900 = 4396^2 + 3030^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3563211 + ... + 3563218.

Almost surely, 2^28505716 is an apocalyptic number.

It is an amenable number.

28505716 is a deficient number, since it is larger than the sum of its proper divisors (21379294).

28505716 is a wasteful number, since it uses less digits than its factorization.

28505716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7126433 (or 7126431 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 28505716 is about 5339.0744516255. The cubic root of 28505716 is about 305.4761567265.

The spelling of 28505716 in words is "twenty-eight million, five hundred five thousand, seven hundred sixteen".