2173812856 has 64 divisors (see below), whose sum is σ = 4322678400. Its totient is φ = 1023318912.

The previous prime is 2173812811. The next prime is 2173812881. The reversal of 2173812856 is 6582183712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1662555 + ... + 1663861.

It is an arithmetic number, because the mean of its divisors is an integer number (67541850).

Almost surely, 2^2173812856 is an apocalyptic number.

It is an amenable number.

2173812856 is a deficient number, since it is larger than the sum of its proper divisors (2148865544).

2173812856 is a wasteful number, since it uses less digits than its factorization.

2173812856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516 (or 1512 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 2173812856 is about 46624.1660086269. The cubic root of 2173812856 is about 1295.4104145816.

The spelling of 2173812856 in words is "two billion, one hundred seventy-three million, eight hundred twelve thousand, eight hundred fifty-six".