28688823 has 12 divisors (see below), whose sum is σ = 42974568. Its totient is φ = 19125720.

The previous prime is 28688813. The next prime is 28688827. The reversal of 28688823 is 32888682.

It is not a de Polignac number, because 28688823 - 2¹² = 28684727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28688827) 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, 58788 + ... + 59273.

It is an arithmetic number, because the mean of its divisors is an integer number (3581214).

Almost surely, 2^28688823 is an apocalyptic number.

28688823 is a deficient number, since it is larger than the sum of its proper divisors (14285745).

28688823 is an equidigital number, since it uses as much as digits as its factorization.

28688823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118076 (or 118064 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 28688823 is about 5356.1948246866. The cubic root of 28688823 is about 306.1288384797.

The spelling of 28688823 in words is "twenty-eight million, six hundred eighty-eight thousand, eight hundred twenty-three".