878978957 has 2 divisors, whose sum is σ = 878978958. Its totient is φ = 878978956.

The previous prime is 878978941. The next prime is 878978987. The reversal of 878978957 is 759879878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 542843401 + 336135556 = 23299^2 + 18334^2 .

It is a cyclic number.

It is not a de Polignac number, because 878978957 - 2⁴ = 878978941 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 (878978987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439489478 + 439489479.

It is an arithmetic number, because the mean of its divisors is an integer number (439489479).

Almost surely, 2^878978957 is an apocalyptic number.

It is an amenable number.

878978957 is a deficient number, since it is larger than the sum of its proper divisors (1).

878978957 is an equidigital number, since it uses as much as digits as its factorization.

878978957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71124480, while the sum is 68.

The square root of 878978957 is about 29647.5792772361. The cubic root of 878978957 is about 957.9132033031.

The spelling of 878978957 in words is "eight hundred seventy-eight million, nine hundred seventy-eight thousand, nine hundred fifty-seven".