28656571 has 2 divisors, whose sum is σ = 28656572. Its totient is φ = 28656570.

The previous prime is 28656491. The next prime is 28656599. The reversal of 28656571 is 17565682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28656571 - 2¹⁷ = 28525499 is a prime.

It is a super-2 number, since 2×28656571² = 1642398122956082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28656071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14328285 + 14328286.

It is an arithmetic number, because the mean of its divisors is an integer number (14328286).

Almost surely, 2^28656571 is an apocalyptic number.

28656571 is a deficient number, since it is larger than the sum of its proper divisors (1).

28656571 is an equidigital number, since it uses as much as digits as its factorization.

28656571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The square root of 28656571 is about 5353.1832585855. The cubic root of 28656571 is about 306.0140786949.

The spelling of 28656571 in words is "twenty-eight million, six hundred fifty-six thousand, five hundred seventy-one".