878504312857 has 4 divisors (see below), whose sum is σ = 882180063360. Its totient is φ = 874828562356.

The previous prime is 878504312849. The next prime is 878504312897. The reversal of 878504312857 is 758213405878.

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: 758213405878 = 2 ⋅379106702939.

It is a cyclic number.

It is not a de Polignac number, because 878504312857 - 2³ = 878504312849 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878504312827) 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, 1837874893 + ... + 1837875370.

It is an arithmetic number, because the mean of its divisors is an integer number (220545015840).

Almost surely, 2^878504312857 is an apocalyptic number.

It is an amenable number.

878504312857 is a deficient number, since it is larger than the sum of its proper divisors (3675750503).

878504312857 is a wasteful number, since it uses less digits than its factorization.

878504312857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675750502.

The product of its (nonzero) digits is 15052800, while the sum is 58.

The spelling of 878504312857 in words is "eight hundred seventy-eight billion, five hundred four million, three hundred twelve thousand, eight hundred fifty-seven".