28565136 has 140 divisors (see below), whose sum is σ = 86740480. Its totient is φ = 9097920.

The previous prime is 28565111. The next prime is 28565137. The reversal of 28565136 is 63156582.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28565136.

It is not an unprimeable number, because it can be changed into a prime (28565137) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 361545 + ... + 361623.

Almost surely, 2^28565136 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 28565136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43370240).

28565136 is an abundant number, since it is smaller than the sum of its proper divisors (58175344).

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

28565136 is an equidigital number, since it uses as much as digits as its factorization.

28565136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 115 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 28565136 is about 5344.6361896765. The cubic root of 28565136 is about 305.6882638429.

The spelling of 28565136 in words is "twenty-eight million, five hundred sixty-five thousand, one hundred thirty-six".