28081307 has 8 divisors (see below), whose sum is σ = 28583184. Its totient is φ = 27583488.

The previous prime is 28081253. The next prime is 28081337. The reversal of 28081307 is 70318082.

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 28081307 - 2⁶ = 28081243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28081307.

It is not an unprimeable number, because it can be changed into a prime (28081337) 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, 15143 + ... + 16895.

It is an arithmetic number, because the mean of its divisors is an integer number (3572898).

Almost surely, 2^28081307 is an apocalyptic number.

28081307 is a deficient number, since it is larger than the sum of its proper divisors (501877).

28081307 is a wasteful number, since it uses less digits than its factorization.

28081307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 28081307 is about 5299.1798422020. The cubic root of 28081307 is about 303.9525368825.

Adding to 28081307 its reverse (70318082), we get a palindrome (98399389).

The spelling of 28081307 in words is "twenty-eight million, eighty-one thousand, three hundred seven".