720511 has 8 divisors (see below), whose sum is σ = 832464. Its totient is φ = 616320.

The previous prime is 720497. The next prime is 720527. The reversal of 720511 is 115027.

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

It is a cyclic number.

It is not a de Polignac number, because 720511 - 2¹¹ = 718463 is a prime.

It is a super-2 number, since 2×720511² = 1038272202242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720571) 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, 1740 + ... + 2113.

It is an arithmetic number, because the mean of its divisors is an integer number (104058).

2⁷²⁰⁵¹¹ is an apocalyptic number.

720511 is a deficient number, since it is larger than the sum of its proper divisors (111953).

720511 is a wasteful number, since it uses less digits than its factorization.

720511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 720511 is about 848.8291936544. The cubic root of 720511 is about 89.6492936004.

Adding to 720511 its reverse (115027), we get a palindrome (835538).

The spelling of 720511 in words is "seven hundred twenty thousand, five hundred eleven".