28812686049 has 81 divisors (see below), whose sum is σ = 49609718067. Its totient is φ = 16067193408.

The previous prime is 28812686047. The next prime is 28812686069. The reversal of 28812686049 is 94068621882.

The square root of 28812686049 is 169743.

It is a perfect power (a square), and thus also a powerful number.

28812686049 is a `hidden beast` number, since 2 + 8 + 8 + 1 + 26 + 8 + 604 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16924709025 + 11887977024 = 130095^2 + 109032^2 .

It is not a de Polignac number, because 28812686049 - 2¹ = 28812686047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28812685986 and 28812686004.

It is not an unprimeable number, because it can be changed into a prime (28812686047) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 210311509 + ... + 210311645.

Almost surely, 2^28812686049 is an apocalyptic number.

28812686049 is the 169743-rd square number.

28812686049 is the 84872-nd centered octagonal number.

It is an amenable number.

28812686049 is a deficient number, since it is larger than the sum of its proper divisors (20797032018).

28812686049 is an equidigital number, since it uses as much as digits as its factorization.

28812686049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 28812686049 in words is "twenty-eight billion, eight hundred twelve million, six hundred eighty-six thousand, forty-nine".