28003536 has 160 divisors (see below), whose sum is σ = 89994240. Its totient is φ = 8265600.

The previous prime is 28003529. The next prime is 28003543. The reversal of 28003536 is 63530082.

It is an interprime number because it is at equal distance from previous prime (28003529) and next prime (28003543).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 337351 + ... + 337433.

It is an arithmetic number, because the mean of its divisors is an integer number (562464).

Almost surely, 2^28003536 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 28003536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44997120).

28003536 is an abundant number, since it is smaller than the sum of its proper divisors (61990704).

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

28003536 is a wasteful number, since it uses less digits than its factorization.

28003536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 28003536 is about 5291.8367321753. The cubic root of 28003536 is about 303.6716792431.

It can be divided in two parts, 2800 and 3536, that added together give a palindrome (6336).

The spelling of 28003536 in words is "twenty-eight million, three thousand, five hundred thirty-six".