28807845 has 32 divisors (see below), whose sum is σ = 52475904. Its totient is φ = 13358400.

The previous prime is 28807841. The next prime is 28807853. The reversal of 28807845 is 54870882.

28807845 is a nontrivial binomial coefficient, being equal to C(7591, 2).

It is not a de Polignac number, because 28807845 - 2² = 28807841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28807797 and 28807806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28807841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1 + ... + 7590.

It is an arithmetic number, because the mean of its divisors is an integer number (1639872).

Almost surely, 2^28807845 is an apocalyptic number.

28807845 is the 7590-th triangular number.

It is an amenable number.

28807845 is a deficient number, since it is larger than the sum of its proper divisors (23668059).

28807845 is a wasteful number, since it uses less digits than its factorization.

28807845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7633.

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 28807845 is about 5367.2940109519. The cubic root of 28807845 is about 306.5516023636.

The spelling of 28807845 in words is "twenty-eight million, eight hundred seven thousand, eight hundred forty-five".