720671 has 4 divisors (see below), whose sum is σ = 823632. Its totient is φ = 617712.

The previous prime is 720661. The next prime is 720677. The reversal of 720671 is 176027.

It is a happy number.

720671 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176027 = 103 ⋅1709.

It is a cyclic number.

It is not a de Polignac number, because 720671 - 2⁶ = 720607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51470 + ... + 51483.

It is an arithmetic number, because the mean of its divisors is an integer number (205908).

2⁷²⁰⁶⁷¹ is an apocalyptic number.

720671 is a deficient number, since it is larger than the sum of its proper divisors (102961).

720671 is a wasteful number, since it uses less digits than its factorization.

720671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102960.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 720671 is about 848.9234358881. The cubic root of 720671 is about 89.6559290880.

Adding to 720671 its reverse (176027), we get a palindrome (896698).

Subtracting from 720671 its reverse (176027), we obtain a square (544644 = 738²).

The spelling of 720671 in words is "seven hundred twenty thousand, six hundred seventy-one".