255643620 has 144 divisors (see below), whose sum is σ = 794683008. Its totient is φ = 61276160.

The previous prime is 255643607. The next prime is 255643649. The reversal of 255643620 is 26346552.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 398500 + ... + 399140.

It is an arithmetic number, because the mean of its divisors is an integer number (5518632).

Almost surely, 2^255643620 is an apocalyptic number.

255643620 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 255643620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (397341504).

255643620 is an abundant number, since it is smaller than the sum of its proper divisors (539039388).

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

255643620 is a wasteful number, since it uses less digits than its factorization.

255643620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 255643620 is about 15988.8592463628. The cubic root of 255643620 is about 634.6656391707.

The spelling of 255643620 in words is "two hundred fifty-five million, six hundred forty-three thousand, six hundred twenty".