28223718 has 16 divisors (see below), whose sum is σ = 56893440. Its totient is φ = 9333576.

The previous prime is 28223717. The next prime is 28223731. The reversal of 28223718 is 81732282.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28223717) 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, 17758 + ... + 19281.

It is an arithmetic number, because the mean of its divisors is an integer number (3555840).

Almost surely, 2^28223718 is an apocalyptic number.

28223718 is an abundant number, since it is smaller than the sum of its proper divisors (28669722).

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

28223718 is a wasteful number, since it uses less digits than its factorization.

28223718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37171.

The product of its digits is 10752, while the sum is 33.

The square root of 28223718 is about 5312.5999284719. The cubic root of 28223718 is about 304.4654904121.

The spelling of 28223718 in words is "twenty-eight million, two hundred twenty-three thousand, seven hundred eighteen".