28310240 has 144 divisors (see below), whose sum is σ = 81702432. Its totient is φ = 9225216.

The previous prime is 28310201. The next prime is 28310251. The reversal of 28310240 is 4201382.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180242 + ... + 180398.

It is an arithmetic number, because the mean of its divisors is an integer number (567378).

Almost surely, 2^28310240 is an apocalyptic number.

28310240 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 28310240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40851216).

28310240 is an abundant number, since it is smaller than the sum of its proper divisors (53392192).

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

28310240 is a wasteful number, since it uses less digits than its factorization.

28310240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28310240 is about 5320.7367910845. The cubic root of 28310240 is about 304.7762939015.

The spelling of 28310240 in words is "twenty-eight million, three hundred ten thousand, two hundred forty".