28561457 has 2 divisors, whose sum is σ = 28561458. Its totient is φ = 28561456.

The previous prime is 28561453. The next prime is 28561471. The reversal of 28561457 is 75416582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28398241 + 163216 = 5329^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 28561457 - 2² = 28561453 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28561457.

It is not a weakly prime, because it can be changed into another prime (28561451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14280728 + 14280729.

It is an arithmetic number, because the mean of its divisors is an integer number (14280729).

Almost surely, 2^28561457 is an apocalyptic number.

It is an amenable number.

28561457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28561457 is an equidigital number, since it uses as much as digits as its factorization.

28561457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 28561457 is about 5344.2920017529. The cubic root of 28561457 is about 305.6751397393.

The spelling of 28561457 in words is "twenty-eight million, five hundred sixty-one thousand, four hundred fifty-seven".