255621740 has 48 divisors (see below), whose sum is σ = 592704000. Its totient is φ = 91826880.

The previous prime is 255621727. The next prime is 255621761. The reversal of 255621740 is 47126552.

It is a junction number, because it is equal to n+sod(n) for n = 255621697 and 255621706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11261 + ... + 25259.

It is an arithmetic number, because the mean of its divisors is an integer number (12348000).

Almost surely, 2^255621740 is an apocalyptic number.

255621740 is a gapful number since it is divisible by the number (20) 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 255621740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296352000).

255621740 is an abundant number, since it is smaller than the sum of its proper divisors (337082260).

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

255621740 is a wasteful number, since it uses less digits than its factorization.

255621740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14102 (or 14100 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 255621740 is about 15988.1750052969. The cubic root of 255621740 is about 634.6475320881.

The spelling of 255621740 in words is "two hundred fifty-five million, six hundred twenty-one thousand, seven hundred forty".