28281457 has 2 divisors, whose sum is σ = 28281458. Its totient is φ = 28281456.

The previous prime is 28281439. The next prime is 28281493. The reversal of 28281457 is 75418282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 9928801 = 4284^2 + 3151^2 .

It is a cyclic number.

It is not a de Polignac number, because 28281457 - 2²³ = 19892849 is a prime.

It is not a weakly prime, because it can be changed into another prime (28281427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140728 + 14140729.

It is an arithmetic number, because the mean of its divisors is an integer number (14140729).

Almost surely, 2^28281457 is an apocalyptic number.

It is an amenable number.

28281457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28281457 is an equidigital number, since it uses as much as digits as its factorization.

28281457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35840, while the sum is 37.

The square root of 28281457 is about 5318.0313086705. The cubic root of 28281457 is about 304.6729702666.

The spelling of 28281457 in words is "twenty-eight million, two hundred eighty-one thousand, four hundred fifty-seven".