28078560577 has 4 divisors (see below), whose sum is σ = 28078947760. Its totient is φ = 28078173396.

The previous prime is 28078560571. The next prime is 28078560599. The reversal of 28078560577 is 77506587082.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77506587082 = 2 ⋅38753293541.

It is a cyclic number.

It is not a de Polignac number, because 28078560577 - 2³ = 28078560569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078560571) 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, 48627 + ... + 241912.

It is an arithmetic number, because the mean of its divisors is an integer number (7019736940).

Almost surely, 2^28078560577 is an apocalyptic number.

It is an amenable number.

28078560577 is a deficient number, since it is larger than the sum of its proper divisors (387183).

28078560577 is an equidigital number, since it uses as much as digits as its factorization.

28078560577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387182.

The product of its (nonzero) digits is 6585600, while the sum is 55.

The spelling of 28078560577 in words is "twenty-eight billion, seventy-eight million, five hundred sixty thousand, five hundred seventy-seven".