28271306240 has 40 divisors (see below), whose sum is σ = 67784880240. Its totient is φ = 11308521472.

The previous prime is 28271306233. The next prime is 28271306279. The reversal of 28271306240 is 4260317282.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 28271306240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5519180 + ... + 5524299.

It is an arithmetic number, because the mean of its divisors is an integer number (1694622006).

Almost surely, 2^28271306240 is an apocalyptic number.

28271306240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28271306240 is an abundant number, since it is smaller than the sum of its proper divisors (39513574000).

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

28271306240 is an equidigital number, since it uses as much as digits as its factorization.

28271306240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11043502 (or 11043486 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 28271306240 in words is "twenty-eight billion, two hundred seventy-one million, three hundred six thousand, two hundred forty".