28650240 has 144 divisors (see below), whose sum is σ = 101791200. Its totient is φ = 7630848.

The previous prime is 28650217. The next prime is 28650277. The reversal of 28650240 is 4205682.

28650240 is a `hidden beast` number, since 2 + 8 + 650 + 2 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34146 + ... + 34974.

Almost surely, 2^28650240 is an apocalyptic number.

28650240 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 28650240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50895600).

28650240 is an abundant number, since it is smaller than the sum of its proper divisors (73140960).

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

28650240 is an equidigital number, since it uses as much as digits as its factorization.

28650240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28650240 is about 5352.5918955213. The cubic root of 28650240 is about 305.9915414809.

The spelling of 28650240 in words is "twenty-eight million, six hundred fifty thousand, two hundred forty".