28765836 has 72 divisors (see below), whose sum is σ = 84009744. Its totient is φ = 8202240.

The previous prime is 28765823. The next prime is 28765859. The reversal of 28765836 is 63856782.

It is a junction number, because it is equal to n+sod(n) for n = 28765791 and 28765800.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4596 + ... + 8868.

It is an arithmetic number, because the mean of its divisors is an integer number (1166802).

Almost surely, 2^28765836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28765836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42004872).

28765836 is an abundant number, since it is smaller than the sum of its proper divisors (55243908).

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

28765836 is a wasteful number, since it uses less digits than its factorization.

28765836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311 (or 4306 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28765836 is about 5363.3791587021. The cubic root of 28765836 is about 306.4025203909.

The spelling of 28765836 in words is "twenty-eight million, seven hundred sixty-five thousand, eight hundred thirty-six".