878940691 has 8 divisors (see below), whose sum is σ = 882675360. Its totient is φ = 875214912.

The previous prime is 878940679. The next prime is 878940709. The reversal of 878940691 is 196049878.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 878940691 - 2¹⁵ = 878907923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878940611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254311 + ... + 257743.

It is an arithmetic number, because the mean of its divisors is an integer number (110334420).

Almost surely, 2^878940691 is an apocalyptic number.

878940691 is a deficient number, since it is larger than the sum of its proper divisors (3734669).

878940691 is a wasteful number, since it uses less digits than its factorization.

878940691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 878940691 is about 29646.9339224143. The cubic root of 878940691 is about 957.8993023110.

The spelling of 878940691 in words is "eight hundred seventy-eight million, nine hundred forty thousand, six hundred ninety-one".