28665417 has 32 divisors (see below), whose sum is σ = 45373824. Its totient is φ = 15897600.

The previous prime is 28665409. The next prime is 28665419. The reversal of 28665417 is 71456682.

It is not a de Polignac number, because 28665417 - 2³ = 28665409 is a prime.

It is a super-2 number, since 2×28665417² = 1643412263567778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28665419) 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 in 31 ways as a sum of consecutive naturals, for example, 20067 + ... + 21447.

It is an arithmetic number, because the mean of its divisors is an integer number (1417932).

Almost surely, 2^28665417 is an apocalyptic number.

It is an amenable number.

28665417 is a deficient number, since it is larger than the sum of its proper divisors (16708407).

28665417 is a wasteful number, since it uses less digits than its factorization.

28665417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449.

The product of its digits is 80640, while the sum is 39.

The square root of 28665417 is about 5354.0094321919. The cubic root of 28665417 is about 306.0455632952.

It can be divided in two parts, 286 and 65417, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 28665417 in words is "twenty-eight million, six hundred sixty-five thousand, four hundred seventeen".