621704055 has 48 divisors (see below), whose sum is σ = 1154926080. Its totient is φ = 279753408.

The previous prime is 621704051. The next prime is 621704077. The reversal of 621704055 is 550407126.

It is not a de Polignac number, because 621704055 - 2² = 621704051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621704051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 470686 + ... + 472004.

It is an arithmetic number, because the mean of its divisors is an integer number (24060960).

Almost surely, 2^621704055 is an apocalyptic number.

621704055 is a deficient number, since it is larger than the sum of its proper divisors (533222025).

621704055 is a wasteful number, since it uses less digits than its factorization.

621704055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468 (or 1401 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 621704055 is about 24933.9939640644. The cubic root of 621704055 is about 853.4823938858.

The spelling of 621704055 in words is "six hundred twenty-one million, seven hundred four thousand, fifty-five".