28056437 has 2 divisors, whose sum is σ = 28056438. Its totient is φ = 28056436.

The previous prime is 28056421. The next prime is 28056439. The reversal of 28056437 is 73465082.

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., 22363441 + 5692996 = 4729^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 28056437 - 2⁴ = 28056421 is a prime.

Together with 28056439, 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 = 28056397 and 28056406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28056439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028218 + 14028219.

It is an arithmetic number, because the mean of its divisors is an integer number (14028219).

Almost surely, 2^28056437 is an apocalyptic number.

It is an amenable number.

28056437 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056437 is an equidigital number, since it uses as much as digits as its factorization.

28056437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 28056437 is about 5296.8327328697. The cubic root of 28056437 is about 303.8627792808.

The spelling of 28056437 in words is "twenty-eight million, fifty-six thousand, four hundred thirty-seven".