255871644 has 96 divisors (see below), whose sum is σ = 712298496. Its totient is φ = 69949440.

The previous prime is 255871639. The next prime is 255871657. The reversal of 255871644 is 446178552.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 255871596 and 255871605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252082 + ... + 253094.

It is an arithmetic number, because the mean of its divisors is an integer number (7419776).

Almost surely, 2^255871644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255871644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356149248).

255871644 is an abundant number, since it is smaller than the sum of its proper divisors (456426852).

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

255871644 is a wasteful number, since it uses less digits than its factorization.

255871644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1153 counting only the distinct ones).

The product of its digits is 268800, while the sum is 42.

The square root of 255871644 is about 15995.9883720888. The cubic root of 255871644 is about 634.8542819789.

The spelling of 255871644 in words is "two hundred fifty-five million, eight hundred seventy-one thousand, six hundred forty-four".