28318807 has 4 divisors (see below), whose sum is σ = 30893256. Its totient is φ = 25744360.

The previous prime is 28318799. The next prime is 28318813. The reversal of 28318807 is 70881382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28318807 - 2³ = 28318799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28318307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287208 + ... + 1287229.

It is an arithmetic number, because the mean of its divisors is an integer number (7723314).

Almost surely, 2^28318807 is an apocalyptic number.

28318807 is a deficient number, since it is larger than the sum of its proper divisors (2574449).

28318807 is a wasteful number, since it uses less digits than its factorization.

28318807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574448.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 28318807 is about 5321.5417878656. The cubic root of 28318807 is about 304.8070337230.

The spelling of 28318807 in words is "twenty-eight million, three hundred eighteen thousand, eight hundred seven".