2154817856 has 28 divisors (see below), whose sum is σ = 4423417620. Its totient is φ = 1040256000.

The previous prime is 2154817823. The next prime is 2154817913. The reversal of 2154817856 is 6587184512.

It can be written as a sum of positive squares in 2 ways, for example, as 467251456 + 1687566400 = 21616^2 + 41080^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2154817856.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578645 + ... + 582356.

Almost surely, 2^2154817856 is an apocalyptic number.

It is an amenable number.

2154817856 is an abundant number, since it is smaller than the sum of its proper divisors (2268599764).

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

2154817856 is a wasteful number, since it uses less digits than its factorization.

2154817856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161042 (or 1161032 counting only the distinct ones).

The product of its digits is 537600, while the sum is 47.

The square root of 2154817856 is about 46420.0156828927. The cubic root of 2154817856 is about 1291.6262277972.

The spelling of 2154817856 in words is "two billion, one hundred fifty-four million, eight hundred seventeen thousand, eight hundred fifty-six".