28638265 has 16 divisors (see below), whose sum is σ = 35974656. Its totient is φ = 21859200.

The previous prime is 28638209. The next prime is 28638277. The reversal of 28638265 is 56283682.

It is not a de Polignac number, because 28638265 - 2²¹ = 26541113 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10050 + ... + 12580.

It is an arithmetic number, because the mean of its divisors is an integer number (2248416).

Almost surely, 2^28638265 is an apocalyptic number.

It is an amenable number.

28638265 is a deficient number, since it is larger than the sum of its proper divisors (7336391).

28638265 is a wasteful number, since it uses less digits than its factorization.

28638265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640.

The product of its digits is 138240, while the sum is 40.

The square root of 28638265 is about 5351.4731616631. The cubic root of 28638265 is about 305.9489035676.

The spelling of 28638265 in words is "twenty-eight million, six hundred thirty-eight thousand, two hundred sixty-five".