28604817 has 12 divisors (see below), whose sum is σ = 42743220. Its totient is φ = 18412128.

The previous prime is 28604813. The next prime is 28604819. The reversal of 28604817 is 71840682.

It can be written as a sum of positive squares in 2 ways, for example, as 24295041 + 4309776 = 4929^2 + 2076^2 .

It is not a de Polignac number, because 28604817 - 2² = 28604813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28604813) 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 11 ways as a sum of consecutive naturals, for example, 54538 + ... + 55059.

It is an arithmetic number, because the mean of its divisors is an integer number (3561935).

Almost surely, 2^28604817 is an apocalyptic number.

It is an amenable number.

28604817 is a deficient number, since it is larger than the sum of its proper divisors (14138403).

28604817 is a wasteful number, since it uses less digits than its factorization.

28604817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109632 (or 109629 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28604817 is about 5348.3471278517. The cubic root of 28604817 is about 305.8297463779.

The spelling of 28604817 in words is "twenty-eight million, six hundred four thousand, eight hundred seventeen".