28078560457 has 4 divisors (see below), whose sum is σ = 28139205760. Its totient is φ = 28017915156.

The previous prime is 28078560451. The next prime is 28078560479. The reversal of 28078560457 is 75406587082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28078560457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078560451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30321957 + ... + 30322882.

It is an arithmetic number, because the mean of its divisors is an integer number (7034801440).

Almost surely, 2^28078560457 is an apocalyptic number.

It is an amenable number.

28078560457 is a deficient number, since it is larger than the sum of its proper divisors (60645303).

28078560457 is an equidigital number, since it uses as much as digits as its factorization.

28078560457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60645302.

The product of its (nonzero) digits is 3763200, while the sum is 52.

The spelling of 28078560457 in words is "twenty-eight billion, seventy-eight million, five hundred sixty thousand, four hundred fifty-seven".