28957637 has 2 divisors, whose sum is σ = 28957638. Its totient is φ = 28957636.

The previous prime is 28957561. The next prime is 28957639. The reversal of 28957637 is 73675982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28366276 + 591361 = 5326^2 + 769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28957637 is a prime.

Together with 28957639, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28957591 and 28957600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28957639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14478818 + 14478819.

It is an arithmetic number, because the mean of its divisors is an integer number (14478819).

Almost surely, 2^28957637 is an apocalyptic number.

It is an amenable number.

28957637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28957637 is an equidigital number, since it uses as much as digits as its factorization.

28957637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 28957637 is about 5381.2300638423. The cubic root of 28957637 is about 307.0820090232.

The spelling of 28957637 in words is "twenty-eight million, nine hundred fifty-seven thousand, six hundred thirty-seven".