28643536 has 10 divisors (see below), whose sum is σ = 55496882. Its totient is φ = 14321760.

The previous prime is 28643519. The next prime is 28643557. The reversal of 28643536 is 63534682.

It can be written as a sum of positive squares in only one way, i.e., 28090000 + 553536 = 5300^2 + 744^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28643495 and 28643504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895095 + ... + 895126.

Almost surely, 2^28643536 is an apocalyptic number.

It is an amenable number.

28643536 is a deficient number, since it is larger than the sum of its proper divisors (26853346).

28643536 is a wasteful number, since it uses less digits than its factorization.

28643536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790229 (or 1790223 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 28643536 is about 5351.9656202184. The cubic root of 28643536 is about 305.9676728348.

It can be divided in two parts, 2864 and 3536, that added together give a square (6400 = 80²).

The spelling of 28643536 in words is "twenty-eight million, six hundred forty-three thousand, five hundred thirty-six".