28279317261 has 16 divisors (see below), whose sum is σ = 42743368640. Its totient is φ = 16486727040.

The previous prime is 28279317251. The next prime is 28279317277. The reversal of 28279317261 is 16271397282.

It is a happy number.

It is not a de Polignac number, because 28279317261 - 2⁵ = 28279317229 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28279317261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279317221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19081120 + ... + 19082601.

It is an arithmetic number, because the mean of its divisors is an integer number (2671460540).

Almost surely, 2^28279317261 is an apocalyptic number.

It is an amenable number.

28279317261 is a deficient number, since it is larger than the sum of its proper divisors (14464051379).

28279317261 is a wasteful number, since it uses less digits than its factorization.

28279317261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38163756.

The product of its digits is 508032, while the sum is 48.

The spelling of 28279317261 in words is "twenty-eight billion, two hundred seventy-nine million, three hundred seventeen thousand, two hundred sixty-one".