878161779 has 24 divisors (see below), whose sum is σ = 1456603200. Its totient is φ = 504206640.

The previous prime is 878161777. The next prime is 878161783. The reversal of 878161779 is 977161878.

It is not a de Polignac number, because 878161779 - 2¹ = 878161777 is a prime.

It is a super-2 number, since 2×878161779² = 1542336220192889682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (878161777) 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 23 ways as a sum of consecutive naturals, for example, 231549 + ... + 235310.

It is an arithmetic number, because the mean of its divisors is an integer number (60691800).

Almost surely, 2^878161779 is an apocalyptic number.

878161779 is a deficient number, since it is larger than the sum of its proper divisors (578441421).

878161779 is a wasteful number, since it uses less digits than its factorization.

878161779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466895 (or 466892 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 54.

The square root of 878161779 is about 29633.7945427176. The cubic root of 878161779 is about 957.6162571334.

Subtracting 878161779 from its reverse (977161878), we obtain a palindrome (99000099).

The spelling of 878161779 in words is "eight hundred seventy-eight million, one hundred sixty-one thousand, seven hundred seventy-nine".