28485217 has 8 divisors (see below), whose sum is σ = 30277800. Its totient is φ = 26705664.

The previous prime is 28485209. The next prime is 28485239. The reversal of 28485217 is 71258482.

It can be written as a sum of positive squares in 4 ways, for example, as 2178576 + 26306641 = 1476^2 + 5129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28485217 - 2³ = 28485209 is a prime.

It is a super-2 number, since 2×28485217² = 1622815175074178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28485277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1459 + ... + 7687.

It is an arithmetic number, because the mean of its divisors is an integer number (3784725).

Almost surely, 2^28485217 is an apocalyptic number.

It is an amenable number.

28485217 is a deficient number, since it is larger than the sum of its proper divisors (1792583).

28485217 is a wasteful number, since it uses less digits than its factorization.

28485217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6515.

The product of its digits is 35840, while the sum is 37.

The square root of 28485217 is about 5337.1543916211. The cubic root of 28485217 is about 305.4029146048.

It can be divided in two parts, 284852 and 17, that multiplied together give a palindrome (4842484).

The spelling of 28485217 in words is "twenty-eight million, four hundred eighty-five thousand, two hundred seventeen".