28887497 has 2 divisors, whose sum is σ = 28887498. Its totient is φ = 28887496.

The previous prime is 28887479. The next prime is 28887511. The reversal of 28887497 is 79478882.

It is a happy number.

Together with previous prime (28887479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23775376 + 5112121 = 4876^2 + 2261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28887497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28887407) 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, 14443748 + 14443749.

It is an arithmetic number, because the mean of its divisors is an integer number (14443749).

Almost surely, 2^28887497 is an apocalyptic number.

It is an amenable number.

28887497 is a deficient number, since it is larger than the sum of its proper divisors (1).

28887497 is an equidigital number, since it uses as much as digits as its factorization.

28887497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336, while the sum is 53.

The square root of 28887497 is about 5374.7090153793. The cubic root of 28887497 is about 306.8338747615.

The spelling of 28887497 in words is "twenty-eight million, eight hundred eighty-seven thousand, four hundred ninety-seven".