28812860257 has 2 divisors, whose sum is σ = 28812860258. Its totient is φ = 28812860256.

The previous prime is 28812860233. The next prime is 28812860359. The reversal of 28812860257 is 75206821882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23040507681 + 5772352576 = 151791^2 + 75976^2 .

It is a cyclic number.

It is not a de Polignac number, because 28812860257 - 2¹⁵ = 28812827489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28812860257.

It is not a weakly prime, because it can be changed into another prime (28812860207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14406430128 + 14406430129.

It is an arithmetic number, because the mean of its divisors is an integer number (14406430129).

Almost surely, 2^28812860257 is an apocalyptic number.

It is an amenable number.

28812860257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28812860257 is an equidigital number, since it uses as much as digits as its factorization.

28812860257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 860160, while the sum is 49.

The spelling of 28812860257 in words is "twenty-eight billion, eight hundred twelve million, eight hundred sixty thousand, two hundred fifty-seven".