28241240 has 32 divisors (see below), whose sum is σ = 66307680. Its totient is φ = 10804992.

The previous prime is 28241221. The next prime is 28241243. The reversal of 28241240 is 4214282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28241243) 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, 14429 + ... + 16268.

It is an arithmetic number, because the mean of its divisors is an integer number (2072115).

Almost surely, 2^28241240 is an apocalyptic number.

28241240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28241240 is an abundant number, since it is smaller than the sum of its proper divisors (38066440).

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

28241240 is a wasteful number, since it uses less digits than its factorization.

28241240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30731 (or 30727 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 28241240 is about 5314.2487709929. The cubic root of 28241240 is about 304.5284840108.

The spelling of 28241240 in words is "twenty-eight million, two hundred forty-one thousand, two hundred forty".