255511620 has 288 divisors, whose sum is σ = 1005338880. Its totient is φ = 51010560.

The previous prime is 255511591. The next prime is 255511621. The reversal of 255511620 is 26115552.

255511620 is a `hidden beast` number, since 25 + 5 + 5 + 11 + 620 = 666.

255511620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255511621) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 310810 + ... + 311630.

It is an arithmetic number, because the mean of its divisors is an integer number (3490760).

Almost surely, 2^255511620 is an apocalyptic number.

255511620 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 255511620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (502669440).

255511620 is an abundant number, since it is smaller than the sum of its proper divisors (749827260).

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

255511620 is a wasteful number, since it uses less digits than its factorization.

255511620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 255511620 is about 15984.7308391477. The cubic root of 255511620 is about 634.5563851402.

The spelling of 255511620 in words is "two hundred fifty-five million, five hundred eleven thousand, six hundred twenty".