255661420 has 36 divisors (see below), whose sum is σ = 624546720. Its totient is φ = 87655008.

The previous prime is 255661411. The next prime is 255661423. The reversal of 255661420 is 24166552.

It is not an unprimeable number, because it can be changed into a prime (255661423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129460 + ... + 131419.

It is an arithmetic number, because the mean of its divisors is an integer number (17348520).

Almost surely, 2^255661420 is an apocalyptic number.

255661420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255661420 is an abundant number, since it is smaller than the sum of its proper divisors (368885300).

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

255661420 is a wasteful number, since it uses less digits than its factorization.

255661420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260902 (or 260893 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 255661420 is about 15989.4158742588. The cubic root of 255661420 is about 634.6803690333.

The spelling of 255661420 in words is "two hundred fifty-five million, six hundred sixty-one thousand, four hundred twenty".