620709 has 8 divisors (see below), whose sum is σ = 835392. Its totient is φ = 409920.

The previous prime is 620693. The next prime is 620717. The reversal of 620709 is 907026.

620709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 620709 - 2⁴ = 620693 is a prime.

620709 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 620709.

It is not an unprimeable number, because it can be changed into a prime (620759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577 + ... + 1254.

It is an arithmetic number, because the mean of its divisors is an integer number (104424).

2⁶²⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

620709 is a deficient number, since it is larger than the sum of its proper divisors (214683).

620709 is a wasteful number, since it uses less digits than its factorization.

620709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 620709 is about 787.8508742141. The cubic root of 620709 is about 85.3026809802.

The spelling of 620709 in words is "six hundred twenty thousand, seven hundred nine".