878884661 has 2 divisors, whose sum is σ = 878884662. Its totient is φ = 878884660.

The previous prime is 878884639. The next prime is 878884693. The reversal of 878884661 is 166488878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512162161 + 366722500 = 22631^2 + 19150^2 .

It is a cyclic number.

It is not a de Polignac number, because 878884661 - 2⁶ = 878884597 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 878884597 and 878884606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878884361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439442330 + 439442331.

It is an arithmetic number, because the mean of its divisors is an integer number (439442331).

Almost surely, 2^878884661 is an apocalyptic number.

It is an amenable number.

878884661 is a deficient number, since it is larger than the sum of its proper divisors (1).

878884661 is an equidigital number, since it uses as much as digits as its factorization.

878884661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4128768, while the sum is 56.

The square root of 878884661 is about 29645.9889529764. The cubic root of 878884661 is about 957.8789474153.

The spelling of 878884661 in words is "eight hundred seventy-eight million, eight hundred eighty-four thousand, six hundred sixty-one".