28597397 has 2 divisors, whose sum is σ = 28597398. Its totient is φ = 28597396.

The previous prime is 28597381. The next prime is 28597399. The reversal of 28597397 is 79379582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28238596 + 358801 = 5314^2 + 599^2 .

It is a cyclic number.

It is not a de Polignac number, because 28597397 - 2⁴ = 28597381 is a prime.

It is a super-2 number, since 2×28597397² = 1635622230351218, which contains 22 as substring.

Together with 28597399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28597399) 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, 14298698 + 14298699.

It is an arithmetic number, because the mean of its divisors is an integer number (14298699).

Almost surely, 2^28597397 is an apocalyptic number.

It is an amenable number.

28597397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28597397 is an equidigital number, since it uses as much as digits as its factorization.

28597397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 50.

The square root of 28597397 is about 5347.6534106092. The cubic root of 28597397 is about 305.8033003314.

The spelling of 28597397 in words is "twenty-eight million, five hundred ninety-seven thousand, three hundred ninety-seven".