28887813 has 8 divisors (see below), whose sum is σ = 42796800. Its totient is φ = 19258524.

The previous prime is 28887797. The next prime is 28887823. The reversal of 28887813 is 31878882.

It is a happy number.

It is not a de Polignac number, because 28887813 - 2⁴ = 28887797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28887823) 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, 534933 + ... + 534986.

It is an arithmetic number, because the mean of its divisors is an integer number (5349600).

Almost surely, 2^28887813 is an apocalyptic number.

It is an amenable number.

28887813 is a deficient number, since it is larger than the sum of its proper divisors (13908987).

28887813 is a wasteful number, since it uses less digits than its factorization.

28887813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069928 (or 1069922 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 28887813 is about 5374.7384122392. The cubic root of 28887813 is about 306.8349935749.

It can be divided in two parts, 2888 and 7813, that added together give a palindrome (10701).

The spelling of 28887813 in words is "twenty-eight million, eight hundred eighty-seven thousand, eight hundred thirteen".