878717842 has 4 divisors (see below), whose sum is σ = 1318076766. Its totient is φ = 439358920.

The previous prime is 878717837. The next prime is 878717881. The reversal of 878717842 is 248717878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248717878 = 2 ⋅124358939.

It can be written as a sum of positive squares in only one way, i.e., 809345601 + 69372241 = 28449^2 + 8329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 878717842.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219679459 + ... + 219679462.

Almost surely, 2^878717842 is an apocalyptic number.

878717842 is a deficient number, since it is larger than the sum of its proper divisors (439358924).

878717842 is a wasteful number, since it uses less digits than its factorization.

878717842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439358923.

The product of its digits is 1404928, while the sum is 52.

The square root of 878717842 is about 29643.1753022513. The cubic root of 878717842 is about 957.8183393415.

The spelling of 878717842 in words is "eight hundred seventy-eight million, seven hundred seventeen thousand, eight hundred forty-two".