621053855 has 24 divisors (see below), whose sum is σ = 804296400. Its totient is φ = 459095040.

The previous prime is 621053833. The next prime is 621053857. The reversal of 621053855 is 558350126.

It is not a de Polignac number, because 621053855 - 2⁶ = 621053791 is a prime.

It is a super-2 number, since 2×621053855² = 771415781620722050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621053857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157751 + ... + 161639.

It is an arithmetic number, because the mean of its divisors is an integer number (33512350).

Almost surely, 2^621053855 is an apocalyptic number.

621053855 is a deficient number, since it is larger than the sum of its proper divisors (183242545).

621053855 is a wasteful number, since it uses less digits than its factorization.

621053855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995 (or 3954 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 621053855 is about 24920.9521286808. The cubic root of 621053855 is about 853.1847561180.

The spelling of 621053855 in words is "six hundred twenty-one million, fifty-three thousand, eight hundred fifty-five".