28225340 has 96 divisors (see below), whose sum is σ = 71124480. Its totient is φ = 9273600.

The previous prime is 28225331. The next prime is 28225349. The reversal of 28225340 is 4352282.

It is an interprime number because it is at equal distance from previous prime (28225331) and next prime (28225349).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28225349) 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, 202991 + ... + 203129.

It is an arithmetic number, because the mean of its divisors is an integer number (740880).

Almost surely, 2^28225340 is an apocalyptic number.

28225340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28225340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35562240).

28225340 is an abundant number, since it is smaller than the sum of its proper divisors (42899140).

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

28225340 is a wasteful number, since it uses less digits than its factorization.

28225340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 28225340 is about 5312.7525822308. The cubic root of 28225340 is about 304.4713227829.

The spelling of 28225340 in words is "twenty-eight million, two hundred twenty-five thousand, three hundred forty".