28722204 has 72 divisors (see below), whose sum is σ = 83472480. Its totient is φ = 8157312.

The previous prime is 28722179. The next prime is 28722229. The reversal of 28722204 is 40222782.

It is an interprime number because it is at equal distance from previous prime (28722179) and next prime (28722229).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73642 + ... + 74030.

It is an arithmetic number, because the mean of its divisors is an integer number (1159340).

Almost surely, 2^28722204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28722204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41736240).

28722204 is an abundant number, since it is smaller than the sum of its proper divisors (54750276).

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

28722204 is a wasteful number, since it uses less digits than its factorization.

28722204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28722204 is about 5359.3100302184. The cubic root of 28722204 is about 306.2475249557.

Adding to 28722204 its reverse (40222782), we get a palindrome (68944986).

The spelling of 28722204 in words is "twenty-eight million, seven hundred twenty-two thousand, two hundred four".