28544436 has 72 divisors (see below), whose sum is σ = 74692800. Its totient is φ = 9187200.

The previous prime is 28544429. The next prime is 28544443. The reversal of 28544436 is 63444582.

It is an interprime number because it is at equal distance from previous prime (28544429) and next prime (28544443).

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 28544436.

It is a congruent number.

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, 188961 + ... + 189111.

It is an arithmetic number, because the mean of its divisors is an integer number (1037400).

Almost surely, 2^28544436 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 28544436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37346400).

28544436 is an abundant number, since it is smaller than the sum of its proper divisors (46148364).

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

28544436 is a wasteful number, since it uses less digits than its factorization.

28544436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 304 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 28544436 is about 5342.6993177606. The cubic root of 28544436 is about 305.6144060212.

The spelling of 28544436 in words is "twenty-eight million, five hundred forty-four thousand, four hundred thirty-six".