28697085 has 28 divisors (see below), whose sum is σ = 51637692. Its totient is φ = 15303168.

The previous prime is 28697083. The next prime is 28697093. The reversal of 28697085 is 58079682.

It can be written as a sum of positive squares in 2 ways, for example, as 4549689 + 24147396 = 2133^2 + 4914^2 .

It is not a de Polignac number, because 28697085 - 2¹ = 28697083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28697085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28697083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 292 + ... + 7581.

Almost surely, 2^28697085 is an apocalyptic number.

It is an amenable number.

28697085 is a deficient number, since it is larger than the sum of its proper divisors (22940607).

28697085 is an frugal number, since it uses more digits than its factorization.

28697085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7896 (or 7881 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28697085 is about 5356.9660256530. The cubic root of 28697085 is about 306.1582226724.

The spelling of 28697085 in words is "twenty-eight million, six hundred ninety-seven thousand, eighty-five".