878641894881 has 63 divisors (see below), whose sum is σ = 1331977425289. Its totient is φ = 579332855232.

The previous prime is 878641894853. The next prime is 878641894901. The reversal of 878641894881 is 188498146878.

The square root of 878641894881 is 937359.

It is a perfect power (a square), and thus also a powerful number.

878641894881 is a `hidden beast` number, since 8 + 7 + 8 + 64 + 1 + 89 + 488 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 411721139025 + 466920755856 = 641655^2 + 683316^2 .

It is a de Polignac number, because none of the positive numbers 2^k-878641894881 is a prime.

It is a super-2 number, since 2×878641894881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878641894841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 3770995141 + ... + 3770995373.

Almost surely, 2^878641894881 is an apocalyptic number.

878641894881 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

878641894881 is the 937359-th square number.

878641894881 is the 468680-th centered octagonal number.

It is an amenable number.

878641894881 is a deficient number, since it is larger than the sum of its proper divisors (453335530408).

878641894881 is an frugal number, since it uses more digits than its factorization.

878641894881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782 (or 385 counting only the distinct ones).

The product of its digits is 198180864, while the sum is 72.

The spelling of 878641894881 in words is "eight hundred seventy-eight billion, six hundred forty-one million, eight hundred ninety-four thousand, eight hundred eighty-one".