621857055 has 16 divisors (see below), whose sum is σ = 1027067904. Its totient is φ = 320958240.

The previous prime is 621857017. The next prime is 621857069. The reversal of 621857055 is 550758126.

It is not a de Polignac number, because 621857055 - 2¹⁰ = 621856031 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 668199 + ... + 669128.

It is an arithmetic number, because the mean of its divisors is an integer number (64191744).

Almost surely, 2^621857055 is an apocalyptic number.

621857055 is a deficient number, since it is larger than the sum of its proper divisors (405210849).

621857055 is a wasteful number, since it uses less digits than its factorization.

621857055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337366.

The product of its (nonzero) digits is 84000, while the sum is 39.

The square root of 621857055 is about 24937.0618758506. The cubic root of 621857055 is about 853.5524015229.

The spelling of 621857055 in words is "six hundred twenty-one million, eight hundred fifty-seven thousand, fifty-five".