28201307 has 4 divisors (see below), whose sum is σ = 28235760. Its totient is φ = 28166856.

The previous prime is 28201279. The next prime is 28201309. The reversal of 28201307 is 70310282.

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 28201307 - 2⁸ = 28201051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28201309) 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, 15968 + ... + 17645.

It is an arithmetic number, because the mean of its divisors is an integer number (7058940).

Almost surely, 2^28201307 is an apocalyptic number.

28201307 is a deficient number, since it is larger than the sum of its proper divisors (34453).

28201307 is an equidigital number, since it uses as much as digits as its factorization.

28201307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34452.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 28201307 is about 5310.4902786843. The cubic root of 28201307 is about 304.3848822875.

Adding to 28201307 its reverse (70310282), we get a palindrome (98511589).

The spelling of 28201307 in words is "twenty-eight million, two hundred one thousand, three hundred seven".