28285267531 has 2 divisors, whose sum is σ = 28285267532. Its totient is φ = 28285267530.

The previous prime is 28285267513. The next prime is 28285267561. The reversal of 28285267531 is 13576258282.

Together with previous prime (28285267513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28285267531 - 2⁹ = 28285267019 is a prime.

It is a super-2 number, since 2×28285267531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28285267501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14142633765 + 14142633766.

It is an arithmetic number, because the mean of its divisors is an integer number (14142633766).

Almost surely, 2^28285267531 is an apocalyptic number.

28285267531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28285267531 is an equidigital number, since it uses as much as digits as its factorization.

28285267531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1612800, while the sum is 49.

The spelling of 28285267531 in words is "twenty-eight billion, two hundred eighty-five million, two hundred sixty-seven thousand, five hundred thirty-one".