28006685 has 24 divisors (see below), whose sum is σ = 39617280. Its totient is φ = 18948384.

The previous prime is 28006681. The next prime is 28006691. The reversal of 28006685 is 58660082.

It is not a de Polignac number, because 28006685 - 2² = 28006681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28006681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18632 + ... + 20078.

It is an arithmetic number, because the mean of its divisors is an integer number (1650720).

Almost surely, 2^28006685 is an apocalyptic number.

It is an amenable number.

28006685 is a deficient number, since it is larger than the sum of its proper divisors (11610595).

28006685 is a wasteful number, since it uses less digits than its factorization.

28006685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 28006685 is about 5292.1342575562. The cubic root of 28006685 is about 303.6830614518.

The spelling of 28006685 in words is "twenty-eight million, six thousand, six hundred eighty-five".