28022208 has 28 divisors (see below), whose sum is σ = 74142600. Its totient is φ = 9340672.

The previous prime is 28022173. The next prime is 28022221. The reversal of 28022208 is 80222082.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72783 + ... + 73166.

It is an arithmetic number, because the mean of its divisors is an integer number (2647950).

Almost surely, 2^28022208 is an apocalyptic number.

It is an amenable number.

28022208 is an abundant number, since it is smaller than the sum of its proper divisors (46120392).

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

28022208 is a wasteful number, since it uses less digits than its factorization.

28022208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145964 (or 145954 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28022208 is about 5293.6006649539. The cubic root of 28022208 is about 303.7391576004.

It can be divided in two parts, 2802 and 2208, that multiplied together give a palindrome (6186816).

The spelling of 28022208 in words is "twenty-eight million, twenty-two thousand, two hundred eight".