28736868 has 24 divisors (see below), whose sum is σ = 70997472. Its totient is φ = 9015424.

The previous prime is 28736861. The next prime is 28736887. The reversal of 28736868 is 86863782.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28736861) 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, 70230 + ... + 70637.

It is an arithmetic number, because the mean of its divisors is an integer number (2958228).

Almost surely, 2^28736868 is an apocalyptic number.

It is an amenable number.

28736868 is an abundant number, since it is smaller than the sum of its proper divisors (42260604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28736868 is a wasteful number, since it uses less digits than its factorization.

28736868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140891 (or 140889 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 28736868 is about 5360.6779422010. The cubic root of 28736868 is about 306.2996338824.

The spelling of 28736868 in words is "twenty-eight million, seven hundred thirty-six thousand, eight hundred sixty-eight".