28242320 has 40 divisors (see below), whose sum is σ = 65888640. Its totient is φ = 11258240.

The previous prime is 28242311. The next prime is 28242323. The reversal of 28242320 is 2324282.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (28242323) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 38921 + ... + 39639.

It is an arithmetic number, because the mean of its divisors is an integer number (1647216).

Almost surely, 2^28242320 is an apocalyptic number.

28242320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28242320 is an abundant number, since it is smaller than the sum of its proper divisors (37646320).

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

28242320 is a wasteful number, since it uses less digits than its factorization.

28242320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 28242320 is about 5314.3503836311. The cubic root of 28242320 is about 304.5323658821.

The spelling of 28242320 in words is "twenty-eight million, two hundred forty-two thousand, three hundred twenty".