621808055 has 8 divisors (see below), whose sum is σ = 814003344. Its totient is φ = 452224000.

The previous prime is 621808043. The next prime is 621808063. The reversal of 621808055 is 550808126.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 621808055 - 2¹⁴ = 621791671 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5652746 + ... + 5652855.

It is an arithmetic number, because the mean of its divisors is an integer number (101750418).

Almost surely, 2^621808055 is an apocalyptic number.

621808055 is a deficient number, since it is larger than the sum of its proper divisors (192195289).

621808055 is a wasteful number, since it uses less digits than its factorization.

621808055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11305617.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 621808055 is about 24936.0793830947. The cubic root of 621808055 is about 853.5299820264.

The spelling of 621808055 in words is "six hundred twenty-one million, eight hundred eight thousand, fifty-five".