28722056 has 32 divisors (see below), whose sum is σ = 59590080. Its totient is φ = 12868800.

The previous prime is 28722047. The next prime is 28722059. The reversal of 28722056 is 65022782.

It is not an unprimeable number, because it can be changed into a prime (28722059) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3950 + ... + 8546.

It is an arithmetic number, because the mean of its divisors is an integer number (1862190).

Almost surely, 2^28722056 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 28722056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29795040).

28722056 is an abundant number, since it is smaller than the sum of its proper divisors (30868024).

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

28722056 is a wasteful number, since it uses less digits than its factorization.

28722056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685 (or 4681 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 28722056 is about 5359.2962224531. The cubic root of 28722056 is about 306.2469989432.

The spelling of 28722056 in words is "twenty-eight million, seven hundred twenty-two thousand, fifty-six".