28268362240 has 60 divisors (see below), whose sum is σ = 67798218114. Its totient is φ = 11303942144.

The previous prime is 28268362201. The next prime is 28268362249. The reversal of 28268362240 is 4226386282.

It can be written as a sum of positive squares in only one way, i.e., 25441526016 + 2826836224 = 159504^2 + 53168^2 .

It is not an unprimeable number, because it can be changed into a prime (28268362249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8505219 + ... + 8508541.

Almost surely, 2^28268362240 is an apocalyptic number.

28268362240 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 28268362240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33899109057).

28268362240 is an abundant number, since it is smaller than the sum of its proper divisors (39529855874).

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

28268362240 is an frugal number, since it uses more digits than its factorization.

28268362240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669 (or 3330 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 43.

The spelling of 28268362240 in words is "twenty-eight billion, two hundred sixty-eight million, three hundred sixty-two thousand, two hundred forty".