2158277856 has 48 divisors (see below), whose sum is σ = 6474835584. Its totient is φ = 616650624.

The previous prime is 2158277851. The next prime is 2158277911. The reversal of 2158277856 is 6587728512.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 2158277799 and 2158277808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158277851) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1605190 + ... + 1606533.

It is an arithmetic number, because the mean of its divisors is an integer number (134892408).

Almost surely, 2^2158277856 is an apocalyptic number.

It is an amenable number.

2158277856 is an abundant number, since it is smaller than the sum of its proper divisors (4316557728).

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

2158277856 is a wasteful number, since it uses less digits than its factorization.

2158277856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211743 (or 3211735 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 51.

The square root of 2158277856 is about 46457.2691405769. The cubic root of 2158277856 is about 1292.3171813101.

The spelling of 2158277856 in words is "two billion, one hundred fifty-eight million, two hundred seventy-seven thousand, eight hundred fifty-six".