28218265240 has 128 divisors (see below), whose sum is σ = 70326144000. Its totient is φ = 10104652800.

The previous prime is 28218265237. The next prime is 28218265259. The reversal of 28218265240 is 4256281282.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 28218265193 and 28218265202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10611031 + ... + 10613689.

It is an arithmetic number, because the mean of its divisors is an integer number (549423000).

Almost surely, 2^28218265240 is an apocalyptic number.

28218265240 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 28218265240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35163072000).

28218265240 is an abundant number, since it is smaller than the sum of its proper divisors (42107878760).

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

28218265240 is a wasteful number, since it uses less digits than its factorization.

28218265240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041 (or 3037 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The spelling of 28218265240 in words is "twenty-eight billion, two hundred eighteen million, two hundred sixty-five thousand, two hundred forty".