28085133511 has 2 divisors, whose sum is σ = 28085133512. Its totient is φ = 28085133510.

The previous prime is 28085133469. The next prime is 28085133547. The reversal of 28085133511 is 11533158082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28085133511 is a prime.

It is a super-3 number, since 3×28085133511³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28085131511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14042566755 + 14042566756.

It is an arithmetic number, because the mean of its divisors is an integer number (14042566756).

Almost surely, 2^28085133511 is an apocalyptic number.

28085133511 is a deficient number, since it is larger than the sum of its proper divisors (1).

28085133511 is an equidigital number, since it uses as much as digits as its factorization.

28085133511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 37.

It can be divided in two parts, 28085 and 133511, that added together give a triangular number (161596 = T₅₆₈).

The spelling of 28085133511 in words is "twenty-eight billion, eighty-five million, one hundred thirty-three thousand, five hundred eleven".