28736244 has 36 divisors (see below), whose sum is σ = 74414340. Its totient is φ = 9344640.

The previous prime is 28736243. The next prime is 28736249. The reversal of 28736244 is 44263782.

28736244 is a `hidden beast` number, since 28 + 7 + 3 + 624 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5116644 + 23619600 = 2262^2 + 4860^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 28736199 and 28736208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28736243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8259 + ... + 11210.

It is an arithmetic number, because the mean of its divisors is an integer number (2067065).

Almost surely, 2^28736244 is an apocalyptic number.

It is an amenable number.

28736244 is an abundant number, since it is smaller than the sum of its proper divisors (45678096).

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

28736244 is a wasteful number, since it uses less digits than its factorization.

28736244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19520 (or 19515 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 28736244 is about 5360.6197402912. The cubic root of 28736244 is about 306.2974168424.

The spelling of 28736244 in words is "twenty-eight million, seven hundred thirty-six thousand, two hundred forty-four".