28281587801 has 2 divisors, whose sum is σ = 28281587802. Its totient is φ = 28281587800.

The previous prime is 28281587797. The next prime is 28281587813. The reversal of 28281587801 is 10878518282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16506082576 + 11775505225 = 128476^2 + 108515^2 .

It is a cyclic number.

It is not a de Polignac number, because 28281587801 - 2² = 28281587797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28281587801.

It is not a weakly prime, because it can be changed into another prime (28281587861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140793900 + 14140793901.

It is an arithmetic number, because the mean of its divisors is an integer number (14140793901).

Almost surely, 2^28281587801 is an apocalyptic number.

It is an amenable number.

28281587801 is a deficient number, since it is larger than the sum of its proper divisors (1).

28281587801 is an equidigital number, since it uses as much as digits as its factorization.

28281587801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 573440, while the sum is 50.

The spelling of 28281587801 in words is "twenty-eight billion, two hundred eighty-one million, five hundred eighty-seven thousand, eight hundred one".