28056310231 has 2 divisors, whose sum is σ = 28056310232. Its totient is φ = 28056310230.

The previous prime is 28056310223. The next prime is 28056310253. The reversal of 28056310231 is 13201365082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28056310231 - 2³ = 28056310223 is a prime.

It is a super-2 number, since 2×28056310231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28056310193 and 28056310202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28056310211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028155115 + 14028155116.

It is an arithmetic number, because the mean of its divisors is an integer number (14028155116).

Almost surely, 2^28056310231 is an apocalyptic number.

28056310231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056310231 is an equidigital number, since it uses as much as digits as its factorization.

28056310231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 28056310231 in words is "twenty-eight billion, fifty-six million, three hundred ten thousand, two hundred thirty-one".