28665307 has 8 divisors (see below), whose sum is σ = 31341312. Its totient is φ = 26001000.

The previous prime is 28665293. The next prime is 28665313. The reversal of 28665307 is 70356682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28665307 - 2¹¹ = 28663259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28665367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2682 + ... + 8032.

It is an arithmetic number, because the mean of its divisors is an integer number (3917664).

Almost surely, 2^28665307 is an apocalyptic number.

28665307 is a deficient number, since it is larger than the sum of its proper divisors (2676005).

28665307 is a wasteful number, since it uses less digits than its factorization.

28665307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5849.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 28665307 is about 5353.9991595068. Note that the first 3 decimals coincide. The cubic root of 28665307 is about 306.0451718240.

The spelling of 28665307 in words is "twenty-eight million, six hundred sixty-five thousand, three hundred seven".