28756390801 has 2 divisors, whose sum is σ = 28756390802. Its totient is φ = 28756390800.

The previous prime is 28756390799. The next prime is 28756390829. The reversal of 28756390801 is 10809365782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25198387600 + 3558003201 = 158740^2 + 59649^2 .

It is a cyclic number.

It is not a de Polignac number, because 28756390801 - 2¹ = 28756390799 is a prime.

Together with 28756390799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28756390891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14378195400 + 14378195401.

It is an arithmetic number, because the mean of its divisors is an integer number (14378195401).

Almost surely, 2^28756390801 is an apocalyptic number.

It is an amenable number.

28756390801 is a deficient number, since it is larger than the sum of its proper divisors (1).

28756390801 is an equidigital number, since it uses as much as digits as its factorization.

28756390801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 28756390801 in words is "twenty-eight billion, seven hundred fifty-six million, three hundred ninety thousand, eight hundred one".