620145655 has 24 divisors (see below), whose sum is σ = 795528000. Its totient is φ = 463948992.

The previous prime is 620145653. The next prime is 620145667. The reversal of 620145655 is 556541026.

It is not a de Polignac number, because 620145655 - 2¹ = 620145653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 620145655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620145653) 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, 140421 + ... + 144769.

It is an arithmetic number, because the mean of its divisors is an integer number (33147000).

Almost surely, 2^620145655 is an apocalyptic number.

620145655 is a deficient number, since it is larger than the sum of its proper divisors (175382345).

620145655 is a wasteful number, since it uses less digits than its factorization.

620145655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471 (or 4452 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 620145655 is about 24902.7238470012. The cubic root of 620145655 is about 852.7686674520.

The spelling of 620145655 in words is "six hundred twenty million, one hundred forty-five thousand, six hundred fifty-five".