28643445 has 48 divisors (see below), whose sum is σ = 52565760. Its totient is φ = 14404992.

The previous prime is 28643443. The next prime is 28643471. The reversal of 28643445 is 54434682.

28643445 is a `hidden beast` number, since 2 + 8 + 643 + 4 + 4 + 5 = 666.

It is not a de Polignac number, because 28643445 - 2¹ = 28643443 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61102 + ... + 61568.

It is an arithmetic number, because the mean of its divisors is an integer number (1095120).

Almost surely, 2^28643445 is an apocalyptic number.

It is an amenable number.

28643445 is a deficient number, since it is larger than the sum of its proper divisors (23922315).

28643445 is a wasteful number, since it uses less digits than its factorization.

28643445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 551 counting only the distinct ones).

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

The square root of 28643445 is about 5351.9571186623. The cubic root of 28643445 is about 305.9673488165.

The spelling of 28643445 in words is "twenty-eight million, six hundred forty-three thousand, four hundred forty-five".