720613 has 16 divisors (see below), whose sum is σ = 846720. Its totient is φ = 608256.

The previous prime is 720611. The next prime is 720617. The reversal of 720613 is 316027.

It is a cyclic number.

It is not a de Polignac number, because 720613 - 2¹ = 720611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7381 + ... + 7477.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2⁷²⁰⁶¹³ is an apocalyptic number.

It is an amenable number.

720613 is a deficient number, since it is larger than the sum of its proper divisors (126107).

720613 is a wasteful number, since it uses less digits than its factorization.

720613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 720613 is about 848.8892742873. The cubic root of 720613 is about 89.6535238373.

The spelling of 720613 in words is "seven hundred twenty thousand, six hundred thirteen".