255638784 has 72 divisors (see below), whose sum is σ = 696284512. Its totient is φ = 83220480.

The previous prime is 255638753. The next prime is 255638797. The reversal of 255638784 is 487836552.

255638784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29154 + ... + 36894.

Almost surely, 2^255638784 is an apocalyptic number.

255638784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255638784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348142256).

255638784 is an abundant number, since it is smaller than the sum of its proper divisors (440645728).

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

255638784 is an equidigital number, since it uses as much as digits as its factorization.

255638784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7803 (or 7789 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 48.

The square root of 255638784 is about 15988.7080153463. The cubic root of 255638784 is about 634.6616371640.

The spelling of 255638784 in words is "two hundred fifty-five million, six hundred thirty-eight thousand, seven hundred eighty-four".