28707222 has 16 divisors (see below), whose sum is σ = 58272192. Its totient is φ = 9426120.

The previous prime is 28707179. The next prime is 28707229. The reversal of 28707222 is 22270782.

It is a self number, because there is not a number n which added to its sum of digits gives 28707222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28707229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35304 + ... + 36107.

It is an arithmetic number, because the mean of its divisors is an integer number (3642012).

Almost surely, 2^28707222 is an apocalyptic number.

28707222 is an abundant number, since it is smaller than the sum of its proper divisors (29564970).

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

28707222 is a wasteful number, since it uses less digits than its factorization.

28707222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71483.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 28707222 is about 5357.9120933438. The cubic root of 28707222 is about 306.1942676870.

The spelling of 28707222 in words is "twenty-eight million, seven hundred seven thousand, two hundred twenty-two".