28823643 has 12 divisors (see below), whose sum is σ = 42520608. Its totient is φ = 18806640.

The previous prime is 28823621. The next prime is 28823671. The reversal of 28823643 is 34632882.

28823643 is a `hidden beast` number, since 2 + 8 + 8 + 2 + 3 + 643 = 666.

It is not a de Polignac number, because 28823643 - 2⁵ = 28823611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28823598 and 28823607.

It is not an unprimeable number, because it can be changed into a prime (28823693) 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, 33648 + ... + 34493.

It is an arithmetic number, because the mean of its divisors is an integer number (3543384).

Almost surely, 2^28823643 is an apocalyptic number.

28823643 is a deficient number, since it is larger than the sum of its proper divisors (13696965).

28823643 is a wasteful number, since it uses less digits than its factorization.

28823643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68194 (or 68191 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28823643 is about 5368.7655005597. The cubic root of 28823643 is about 306.6076289680.

The spelling of 28823643 in words is "twenty-eight million, eight hundred twenty-three thousand, six hundred forty-three".