28545636 has 72 divisors (see below), whose sum is σ = 79353120. Its totient is φ = 7959168.

The previous prime is 28545631. The next prime is 28545661. The reversal of 28545636 is 63654582.

It is a junction number, because it is equal to n+sod(n) for n = 28545594 and 28545603.

It is not an unprimeable number, because it can be changed into a prime (28545631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24720 + ... + 25848.

Almost surely, 2^28545636 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 28545636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39676560).

28545636 is an abundant number, since it is smaller than the sum of its proper divisors (50807484).

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

28545636 is a wasteful number, since it uses less digits than its factorization.

28545636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193 (or 1184 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 28545636 is about 5342.8116193630. The cubic root of 28545636 is about 305.6186886088.

The spelling of 28545636 in words is "twenty-eight million, five hundred forty-five thousand, six hundred thirty-six".