620729 has 6 divisors (see below), whose sum is σ = 636474. Its totient is φ = 605360.

The previous prime is 620717. The next prime is 620731. The reversal of 620729 is 927026.

It can be written as a sum of positive squares in only one way, i.e., 565504 + 55225 = 752^2 + 235^2 .

It is a de Polignac number, because none of the positive numbers 2^k-620729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 620698 and 620707.

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

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 5 ways as a sum of consecutive naturals, for example, 2069 + ... + 2349.

It is an arithmetic number, because the mean of its divisors is an integer number (106079).

2⁶²⁰⁷²⁹ is an apocalyptic number.

It is an amenable number.

620729 is a deficient number, since it is larger than the sum of its proper divisors (15745).

620729 is an equidigital number, since it uses as much as digits as its factorization.

620729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 620729 is about 787.8635668693. The cubic root of 620729 is about 85.3035971558.

The spelling of 620729 in words is "six hundred twenty thousand, seven hundred twenty-nine".