28275317280 has 144 divisors (see below), whose sum is σ = 110273776704. Its totient is φ = 6462927360.

The previous prime is 28275317261. The next prime is 28275317281. The reversal of 28275317280 is 8271357282.

28275317280 is a `hidden beast` number, since 28 + 27 + 531 + 72 + 8 + 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 (45).

It is not an unprimeable number, because it can be changed into a prime (28275317281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1392466 + ... + 1412625.

It is an arithmetic number, because the mean of its divisors is an integer number (765790116).

Almost surely, 2^28275317280 is an apocalyptic number.

28275317280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28275317280 is an abundant number, since it is smaller than the sum of its proper divisors (81998459424).

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

28275317280 is a wasteful number, since it uses less digits than its factorization.

28275317280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805119 (or 2805108 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 28275317280 in words is "twenty-eight billion, two hundred seventy-five million, three hundred seventeen thousand, two hundred eighty".