28223910 has 256 divisors, whose sum is σ = 95800320. Its totient is φ = 5806080.

The previous prime is 28223891. The next prime is 28223929. The reversal of 28223910 is 1932282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28223891) and next prime (28223929).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 656349 + ... + 656391.

It is an arithmetic number, because the mean of its divisors is an integer number (374220).

Almost surely, 2^28223910 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28223910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47900160).

28223910 is an abundant number, since it is smaller than the sum of its proper divisors (67576410).

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

28223910 is a wasteful number, since it uses less digits than its factorization.

28223910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28223910 is about 5312.6179986895. The cubic root of 28223910 is about 304.4661808154.

The spelling of 28223910 in words is "twenty-eight million, two hundred twenty-three thousand, nine hundred ten".