28223628 has 12 divisors (see below), whose sum is σ = 65855160. Its totient is φ = 9407872.

The previous prime is 28223627. The next prime is 28223633. The reversal of 28223628 is 82632282.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (28223623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1175973 + ... + 1175996.

It is an arithmetic number, because the mean of its divisors is an integer number (5487930).

Almost surely, 2^28223628 is an apocalyptic number.

It is an amenable number.

28223628 is an abundant number, since it is smaller than the sum of its proper divisors (37631532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28223628 is a wasteful number, since it uses less digits than its factorization.

28223628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351976 (or 2351974 counting only the distinct ones).

The product of its digits is 18432, while the sum is 33.

The square root of 28223628 is about 5312.5914580363. The cubic root of 28223628 is about 304.4651667845.

The spelling of 28223628 in words is "twenty-eight million, two hundred twenty-three thousand, six hundred twenty-eight".