620455221 has 40 divisors (see below), whose sum is σ = 944163000. Its totient is φ = 405993600.

The previous prime is 620455219. The next prime is 620455237. The reversal of 620455221 is 122554026.

It can be written as a sum of positive squares in 4 ways, for example, as 219454596 + 401000625 = 14814^2 + 20025^2 .

It is not a de Polignac number, because 620455221 - 2¹ = 620455219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620450221) 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 39 ways as a sum of consecutive naturals, for example, 1218715 + ... + 1219223.

It is an arithmetic number, because the mean of its divisors is an integer number (23604075).

Almost surely, 2^620455221 is an apocalyptic number.

It is an amenable number.

620455221 is a deficient number, since it is larger than the sum of its proper divisors (323707779).

620455221 is a wasteful number, since it uses less digits than its factorization.

620455221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 620455221 is about 24908.9385763424. The cubic root of 620455221 is about 852.9105396445.

It can be divided in two parts, 6204 and 55221, that added together give a triangular number (61425 = T₃₅₀).

The spelling of 620455221 in words is "six hundred twenty million, four hundred fifty-five thousand, two hundred twenty-one".