620659665 has 64 divisors (see below), whose sum is σ = 1126483200. Its totient is φ = 328224960.

The previous prime is 620659661. The next prime is 620659667. The reversal of 620659665 is 566956026.

It is not a de Polignac number, because 620659665 - 2² = 620659661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 620659665.

It is not an unprimeable number, because it can be changed into a prime (620659661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2307151 + ... + 2307419.

It is an arithmetic number, because the mean of its divisors is an integer number (17601300).

Almost surely, 2^620659665 is an apocalyptic number.

It is an amenable number.

620659665 is a deficient number, since it is larger than the sum of its proper divisors (505823535).

620659665 is an equidigital number, since it uses as much as digits as its factorization.

620659665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The square root of 620659665 is about 24913.0420663555. The cubic root of 620659665 is about 853.0042091997.

The spelling of 620659665 in words is "six hundred twenty million, six hundred fifty-nine thousand, six hundred sixty-five".