28273807 has 4 divisors (see below), whose sum is σ = 28287000. Its totient is φ = 28260616.

The previous prime is 28273769. The next prime is 28273841. The reversal of 28273807 is 70837282.

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 28273807 - 2²³ = 19885199 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 (28273207) 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, 2557 + ... + 7942.

It is an arithmetic number, because the mean of its divisors is an integer number (7071750).

Almost surely, 2^28273807 is an apocalyptic number.

28273807 is a deficient number, since it is larger than the sum of its proper divisors (13193).

28273807 is a wasteful number, since it uses less digits than its factorization.

28273807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13192.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 28273807 is about 5317.3120089007. The cubic root of 28273807 is about 304.6454969248.

The spelling of 28273807 in words is "twenty-eight million, two hundred seventy-three thousand, eight hundred seven".