620866945 has 64 divisors (see below), whose sum is σ = 873400320. Its totient is φ = 420732928.

The previous prime is 620866931. The next prime is 620866997. The reversal of 620866945 is 549668026.

It is not a de Polignac number, because 620866945 - 2⁵ = 620866913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 620866895 and 620866904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2664549 + ... + 2664781.

It is an arithmetic number, because the mean of its divisors is an integer number (13646880).

Almost surely, 2^620866945 is an apocalyptic number.

It is an amenable number.

620866945 is a deficient number, since it is larger than the sum of its proper divisors (252533375).

620866945 is a wasteful number, since it uses less digits than its factorization.

620866945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 620866945 is about 24917.2017891255. The cubic root of 620866945 is about 853.0991571199.

It can be divided in two parts, 6208 and 66945, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 620866945 in words is "six hundred twenty million, eight hundred sixty-six thousand, nine hundred forty-five".