620609 has 12 divisors (see below), whose sum is σ = 715008. Its totient is φ = 537240.

The previous prime is 620603. The next prime is 620623. The reversal of 620609 is 906026.

It is not a de Polignac number, because 620609 - 2¹² = 616513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 620609.

It is not an unprimeable number, because it can be changed into a prime (620603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2672 + ... + 2894.

It is an arithmetic number, because the mean of its divisors is an integer number (59584).

2⁶²⁰⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

620609 is a deficient number, since it is larger than the sum of its proper divisors (94399).

620609 is a wasteful number, since it uses less digits than its factorization.

620609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 620609 is about 787.7874078709. The cubic root of 620609 is about 85.2980998071.

The spelling of 620609 in words is "six hundred twenty thousand, six hundred nine".