878345957 has 2 divisors, whose sum is σ = 878345958. Its totient is φ = 878345956.

The previous prime is 878345891. The next prime is 878345999. The reversal of 878345957 is 759543878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 697012801 + 181333156 = 26401^2 + 13466^2 .

It is a cyclic number.

It is not a de Polignac number, because 878345957 - 2²⁰ = 877297381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878345857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439172978 + 439172979.

It is an arithmetic number, because the mean of its divisors is an integer number (439172979).

Almost surely, 2^878345957 is an apocalyptic number.

It is an amenable number.

878345957 is a deficient number, since it is larger than the sum of its proper divisors (1).

878345957 is an equidigital number, since it uses as much as digits as its factorization.

878345957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8467200, while the sum is 56.

The square root of 878345957 is about 29636.9019467285. The cubic root of 878345957 is about 957.6831998169.

The spelling of 878345957 in words is "eight hundred seventy-eight million, three hundred forty-five thousand, nine hundred fifty-seven".