255403520 has 40 divisors (see below), whose sum is σ = 612375984. Its totient is φ = 102160384.

The previous prime is 255403517. The next prime is 255403537. The reversal of 255403520 is 25304552.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 255403520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47324 + ... + 52443.

Almost surely, 2^255403520 is an apocalyptic number.

255403520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255403520 is an abundant number, since it is smaller than the sum of its proper divisors (356972464).

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

255403520 is an frugal number, since it uses more digits than its factorization.

255403520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99790 (or 99774 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 255403520 is about 15981.3491295322. The cubic root of 255403520 is about 634.4668846821.

The spelling of 255403520 in words is "two hundred fifty-five million, four hundred three thousand, five hundred twenty".