2178938881 has 8 divisors (see below), whose sum is σ = 2570545664. Its totient is φ = 1807414560.

The previous prime is 2178938869. The next prime is 2178938903. The reversal of 2178938881 is 1888398712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2178938881 - 2²¹ = 2176841729 is a prime.

It is a super-2 number, since 2×2178938881² = 9495549294267064322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2178938081) 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, 5020380 + ... + 5020813.

It is an arithmetic number, because the mean of its divisors is an integer number (321318208).

Almost surely, 2^2178938881 is an apocalyptic number.

It is an amenable number.

2178938881 is a deficient number, since it is larger than the sum of its proper divisors (391606783).

2178938881 is a wasteful number, since it uses less digits than its factorization.

2178938881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10041231.

The product of its digits is 1548288, while the sum is 55.

The square root of 2178938881 is about 46679.1054005965. The cubic root of 2178938881 is about 1296.4278424804.

The spelling of 2178938881 in words is "two billion, one hundred seventy-eight million, nine hundred thirty-eight thousand, eight hundred eighty-one".