28708722 has 64 divisors (see below), whose sum is σ = 74338560. Its totient is φ = 8042112.

The previous prime is 28708717. The next prime is 28708723. The reversal of 28708722 is 22780782.

It is not an unprimeable number, because it can be changed into a prime (28708723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19318 + ... + 20750.

It is an arithmetic number, because the mean of its divisors is an integer number (1161540).

Almost surely, 2^28708722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28708722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37169280).

28708722 is an abundant number, since it is smaller than the sum of its proper divisors (45629838).

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

28708722 is a wasteful number, since it uses less digits than its factorization.

28708722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28708722 is about 5358.0520714155. The cubic root of 28708722 is about 306.1996006470.

The spelling of 28708722 in words is "twenty-eight million, seven hundred eight thousand, seven hundred twenty-two".