78872050857 has 4 divisors (see below), whose sum is σ = 105162734480. Its totient is φ = 52581367236.

The previous prime is 78872050853. The next prime is 78872050871. The reversal of 78872050857 is 75805027887.

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 not a de Polignac number, because 78872050857 - 2² = 78872050853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78872050797 and 78872050806.

It is not an unprimeable number, because it can be changed into a prime (78872050853) 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, 13145341807 + ... + 13145341812.

It is an arithmetic number, because the mean of its divisors is an integer number (26290683620).

Almost surely, 2^78872050857 is an apocalyptic number.

It is an amenable number.

78872050857 is a deficient number, since it is larger than the sum of its proper divisors (26290683623).

78872050857 is a wasteful number, since it uses less digits than its factorization.

78872050857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26290683622.

The product of its (nonzero) digits is 8780800, while the sum is 57.

The spelling of 78872050857 in words is "seventy-eight billion, eight hundred seventy-two million, fifty thousand, eight hundred fifty-seven".