28223406 has 48 divisors (see below), whose sum is σ = 63445824. Its totient is φ = 9061632.

The previous prime is 28223389. The next prime is 28223473. The reversal of 28223406 is 60432282.

It is a self number, because there is not a number n which added to its sum of digits gives 28223406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61530 + ... + 61986.

It is an arithmetic number, because the mean of its divisors is an integer number (1321788).

Almost surely, 2^28223406 is an apocalyptic number.

28223406 is an abundant number, since it is smaller than the sum of its proper divisors (35222418).

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

28223406 is a wasteful number, since it uses less digits than its factorization.

28223406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28223406 is about 5312.5705642372. The cubic root of 28223406 is about 304.4643685001.

Adding to 28223406 its reverse (60432282), we get a palindrome (88655688).

The spelling of 28223406 in words is "twenty-eight million, two hundred twenty-three thousand, four hundred six".