878681 has 2 divisors, whose sum is σ = 878682. Its totient is φ = 878680.

The previous prime is 878677. The next prime is 878699. The reversal of 878681 is 186878.

878681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512656 + 366025 = 716^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 878681 - 2² = 878677 is a prime.

It is a super-2 number, since 2×878681² = 1544160599522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 878681.

It is not a weakly prime, because it can be changed into another prime (878621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439340 + 439341.

It is an arithmetic number, because the mean of its divisors is an integer number (439341).

2⁸⁷⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

878681 is a deficient number, since it is larger than the sum of its proper divisors (1).

878681 is an equidigital number, since it uses as much as digits as its factorization.

878681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 878681 is about 937.3798589686. The cubic root of 878681 is about 95.7804953006.

The spelling of 878681 in words is "eight hundred seventy-eight thousand, six hundred eighty-one".