28981457 has 2 divisors, whose sum is σ = 28981458. Its totient is φ = 28981456.

The previous prime is 28981439. The next prime is 28981487. The reversal of 28981457 is 75418982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25897921 + 3083536 = 5089^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 28981457 - 2⁸ = 28981201 is a prime.

It is not a weakly prime, because it can be changed into another prime (28981427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14490728 + 14490729.

It is an arithmetic number, because the mean of its divisors is an integer number (14490729).

Almost surely, 2^28981457 is an apocalyptic number.

It is an amenable number.

28981457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28981457 is an equidigital number, since it uses as much as digits as its factorization.

28981457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 28981457 is about 5383.4428575030. The cubic root of 28981457 is about 307.1661858816.

The spelling of 28981457 in words is "twenty-eight million, nine hundred eighty-one thousand, four hundred fifty-seven".