28188320140 has 12 divisors (see below), whose sum is σ = 59195472336. Its totient is φ = 11275328048.

The previous prime is 28188320137. The next prime is 28188320161. The reversal of 28188320140 is 4102388182.

It is a self number, because there is not a number n which added to its sum of digits gives 28188320140.

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, 704707984 + ... + 704708023.

It is an arithmetic number, because the mean of its divisors is an integer number (4932956028).

Almost surely, 2^28188320140 is an apocalyptic number.

28188320140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28188320140 is an abundant number, since it is smaller than the sum of its proper divisors (31007152196).

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

28188320140 is a wasteful number, since it uses less digits than its factorization.

28188320140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409416016 (or 1409416014 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The spelling of 28188320140 in words is "twenty-eight billion, one hundred eighty-eight million, three hundred twenty thousand, one hundred forty".