28056877531 has 2 divisors, whose sum is σ = 28056877532. Its totient is φ = 28056877530.

The previous prime is 28056877501. The next prime is 28056877547. The reversal of 28056877531 is 13577865082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28056877531 - 2³¹ = 25909393883 is a prime.

It is a super-2 number, since 2×28056877531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28056877501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028438765 + 14028438766.

It is an arithmetic number, because the mean of its divisors is an integer number (14028438766).

Almost surely, 2^28056877531 is an apocalyptic number.

28056877531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056877531 is an equidigital number, since it uses as much as digits as its factorization.

28056877531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 28056877531 in words is "twenty-eight billion, fifty-six million, eight hundred seventy-seven thousand, five hundred thirty-one".