878642069 has 2 divisors, whose sum is σ = 878642070. Its totient is φ = 878642068.

The previous prime is 878642053. The next prime is 878642081. The reversal of 878642069 is 960246878.

878642069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 772284100 + 106357969 = 27790^2 + 10313^2 .

It is a cyclic number.

It is not a de Polignac number, because 878642069 - 2⁴ = 878642053 is a prime.

It is a super-2 number, since 2×878642069² = 1544023770833201522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878645069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439321034 + 439321035.

It is an arithmetic number, because the mean of its divisors is an integer number (439321035).

Almost surely, 2^878642069 is an apocalyptic number.

It is an amenable number.

878642069 is a deficient number, since it is larger than the sum of its proper divisors (1).

878642069 is an equidigital number, since it uses as much as digits as its factorization.

878642069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 878642069 is about 29641.8971896200. The cubic root of 878642069 is about 957.7908072367.

The spelling of 878642069 in words is "eight hundred seventy-eight million, six hundred forty-two thousand, sixty-nine".