878004161 has 4 divisors (see below), whose sum is σ = 878343300. Its totient is φ = 877665024.

The previous prime is 878004157. The next prime is 878004181. The reversal of 878004161 is 161400878.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 671794561 + 206209600 = 25919^2 + 14360^2 .

It is a cyclic number.

It is not a de Polignac number, because 878004161 - 2² = 878004157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878004121) 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, 165656 + ... + 170873.

It is an arithmetic number, because the mean of its divisors is an integer number (219585825).

Almost surely, 2^878004161 is an apocalyptic number.

It is an amenable number.

878004161 is a deficient number, since it is larger than the sum of its proper divisors (339139).

878004161 is a wasteful number, since it uses less digits than its factorization.

878004161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339138.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 878004161 is about 29631.1349934490. The cubic root of 878004161 is about 957.5589607088.

The spelling of 878004161 in words is "eight hundred seventy-eight million, four thousand, one hundred sixty-one".