28314875261 has 6 divisors (see below), whose sum is σ = 29292187710. Its totient is φ = 27337625336.

The previous prime is 28314875257. The next prime is 28314875273. The reversal of 28314875261 is 16257841382.

It can be written as a sum of positive squares in only one way, i.e., 24409375225 + 3905500036 = 156235^2 + 62494^2 .

It is not a de Polignac number, because 28314875261 - 2² = 28314875257 is a prime.

It is a super-2 number, since 2×28314875261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28314875231) 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, 890540 + ... + 921786.

It is an arithmetic number, because the mean of its divisors is an integer number (4882031285).

Almost surely, 2^28314875261 is an apocalyptic number.

It is an amenable number.

28314875261 is a deficient number, since it is larger than the sum of its proper divisors (977312449).

28314875261 is an frugal number, since it uses more digits than its factorization.

28314875261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62523 (or 31276 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The spelling of 28314875261 in words is "twenty-eight billion, three hundred fourteen million, eight hundred seventy-five thousand, two hundred sixty-one".