28643535 has 24 divisors (see below), whose sum is σ = 51252864. Its totient is φ = 14783040.

The previous prime is 28643519. The next prime is 28643557. The reversal of 28643535 is 53534682.

28643535 = 136² + 137² + ... + 445².

It is a happy number.

28643535 is a `hidden beast` number, since 2 + 8 + 643 + 5 + 3 + 5 = 666.

It is not a de Polignac number, because 28643535 - 2⁴ = 28643519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28643535.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8872 + ... + 11661.

It is an arithmetic number, because the mean of its divisors is an integer number (2135536).

Almost surely, 2^28643535 is an apocalyptic number.

28643535 is a deficient number, since it is larger than the sum of its proper divisors (22609329).

28643535 is a wasteful number, since it uses less digits than its factorization.

28643535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20575 (or 20572 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 28643535 is about 5351.9655267948. The cubic root of 28643535 is about 305.9676692742.

The spelling of 28643535 in words is "twenty-eight million, six hundred forty-three thousand, five hundred thirty-five".