28560263361257 has 4 divisors (see below), whose sum is σ = 28585560318420. Its totient is φ = 28534966404096.

The previous prime is 28560263361247. The next prime is 28560263361307. The reversal of 28560263361257 is 75216336206582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16269517535401 + 12290745825856 = 4033549^2 + 3505816^2 .

It is a cyclic number.

It is not a de Polignac number, because 28560263361257 - 2⁸ = 28560263361001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28560263361247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12648476888 + ... + 12648479145.

It is an arithmetic number, because the mean of its divisors is an integer number (7146390079605).

Almost surely, 2^{28560263361257} is an apocalyptic number.

It is an amenable number.

28560263361257 is a deficient number, since it is larger than the sum of its proper divisors (25296957163).

28560263361257 is a wasteful number, since it uses less digits than its factorization.

28560263361257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25296957162.

The product of its (nonzero) digits is 21772800, while the sum is 56.

The spelling of 28560263361257 in words is "twenty-eight trillion, five hundred sixty billion, two hundred sixty-three million, three hundred sixty-one thousand, two hundred fifty-seven".