878640178647 has 64 divisors (see below), whose sum is σ = 1549857521664. Its totient is φ = 428658531840.

The previous prime is 878640178607. The next prime is 878640178673. The reversal of 878640178647 is 746871046878.

It is not a de Polignac number, because 878640178647 - 2⁷ = 878640178519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878640178607) 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 63 ways as a sum of consecutive naturals, for example, 1576578 + ... + 2059824.

It is an arithmetic number, because the mean of its divisors is an integer number (24216523776).

Almost surely, 2^878640178647 is an apocalyptic number.

878640178647 is a deficient number, since it is larger than the sum of its proper divisors (671217343017).

878640178647 is a wasteful number, since it uses less digits than its factorization.

878640178647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483748.

The product of its (nonzero) digits is 101154816, while the sum is 66.

The spelling of 878640178647 in words is "eight hundred seventy-eight billion, six hundred forty million, one hundred seventy-eight thousand, six hundred forty-seven".