878138561061872 has 40 divisors (see below), whose sum is σ = 1866794297897520. Its totient is φ = 396846643450880.

The previous prime is 878138561061869. The next prime is 878138561061911. The reversal of 878138561061872 is 278160165831878.

It is a super-2 number, since 2×878138561061872² (a number of 31 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 878138561061796 and 878138561061805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14420269097 + ... + 14420329992.

It is an arithmetic number, because the mean of its divisors is an integer number (46669857447438).

Almost surely, 2^{878138561061872} is an apocalyptic number.

It is an amenable number.

878138561061872 is an abundant number, since it is smaller than the sum of its proper divisors (988655736835648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

878138561061872 is a wasteful number, since it uses less digits than its factorization.

878138561061872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28840599281 (or 28840599275 counting only the distinct ones).

The product of its (nonzero) digits is 216760320, while the sum is 71.

The spelling of 878138561061872 in words is "eight hundred seventy-eight trillion, one hundred thirty-eight billion, five hundred sixty-one million, sixty-one thousand, eight hundred seventy-two".