878641681 has 8 divisors (see below), whose sum is σ = 956779200. Its totient is φ = 803693520.

The previous prime is 878641679. The next prime is 878641693. The reversal of 878641681 is 186146878.

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 878641681 - 2¹ = 878641679 is a prime.

It is a super-2 number, since 2×878641681² = 1544022407181011522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (878641601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796765 + ... + 797866.

It is an arithmetic number, because the mean of its divisors is an integer number (119597400).

Almost surely, 2^878641681 is an apocalyptic number.

It is an amenable number.

878641681 is a deficient number, since it is larger than the sum of its proper divisors (78137519).

878641681 is a wasteful number, since it uses less digits than its factorization.

878641681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594679.

The product of its digits is 516096, while the sum is 49.

The square root of 878641681 is about 29641.8906448290. The cubic root of 878641681 is about 957.7906662529.

The spelling of 878641681 in words is "eight hundred seventy-eight million, six hundred forty-one thousand, six hundred eighty-one".