28285266521 has 2 divisors, whose sum is σ = 28285266522. Its totient is φ = 28285266520.

The previous prime is 28285266517. The next prime is 28285266533. The reversal of 28285266521 is 12566258282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28235761225 + 49505296 = 168035^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 28285266521 - 2² = 28285266517 is a prime.

It is not a weakly prime, because it can be changed into another prime (28285266511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14142633260 + 14142633261.

It is an arithmetic number, because the mean of its divisors is an integer number (14142633261).

Almost surely, 2^28285266521 is an apocalyptic number.

It is an amenable number.

28285266521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28285266521 is an equidigital number, since it uses as much as digits as its factorization.

28285266521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 921600, while the sum is 47.

The spelling of 28285266521 in words is "twenty-eight billion, two hundred eighty-five million, two hundred sixty-six thousand, five hundred twenty-one".