28368240 has 120 divisors (see below), whose sum is σ = 93647280. Its totient is φ = 7102464.

The previous prime is 28368229. The next prime is 28368251. The reversal of 28368240 is 4286382.

28368240 = 926² + 927² + ... + 957².

It is an interprime number because it is at equal distance from previous prime (28368229) and next prime (28368251).

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69156 + ... + 69564.

It is an arithmetic number, because the mean of its divisors is an integer number (780394).

Almost surely, 2^28368240 is an apocalyptic number.

28368240 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 28368240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46823640).

28368240 is an abundant number, since it is smaller than the sum of its proper divisors (65279040).

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

28368240 is a wasteful number, since it uses less digits than its factorization.

28368240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28368240 is about 5326.1843753291. The cubic root of 28368240 is about 304.9842865684.

The spelling of 28368240 in words is "twenty-eight million, three hundred sixty-eight thousand, two hundred forty".