621240255 has 24 divisors (see below), whose sum is σ = 1079337168. Its totient is φ = 330552576.

The previous prime is 621240253. The next prime is 621240259. The reversal of 621240255 is 552042126.

It is not a de Polignac number, because 621240255 - 2¹ = 621240253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621240251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3544 + ... + 35426.

It is an arithmetic number, because the mean of its divisors is an integer number (44972382).

Almost surely, 2^621240255 is an apocalyptic number.

621240255 is a deficient number, since it is larger than the sum of its proper divisors (458096913).

621240255 is a wasteful number, since it uses less digits than its factorization.

621240255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32327 (or 32324 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 621240255 is about 24924.6916731180. The cubic root of 621240255 is about 853.2701044493.

The spelling of 621240255 in words is "six hundred twenty-one million, two hundred forty thousand, two hundred fifty-five".