28228664 has 32 divisors (see below), whose sum is σ = 54885600. Its totient is φ = 13601280.

The previous prime is 28228663. The next prime is 28228691. The reversal of 28228664 is 46682282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28709 + ... + 29675.

It is an arithmetic number, because the mean of its divisors is an integer number (1715175).

Almost surely, 2^28228664 is an apocalyptic number.

It is an amenable number.

28228664 is a deficient number, since it is larger than the sum of its proper divisors (26656936).

28228664 is a wasteful number, since it uses less digits than its factorization.

28228664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1099 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 28228664 is about 5313.0654052063. The cubic root of 28228664 is about 304.4832744895.

The spelling of 28228664 in words is "twenty-eight million, two hundred twenty-eight thousand, six hundred sixty-four".