720515 has 4 divisors (see below), whose sum is σ = 864624. Its totient is φ = 576408.

The previous prime is 720497. The next prime is 720527. The reversal of 720515 is 515027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515027 = 353 ⋅1459.

It is a cyclic number.

It is not a de Polignac number, because 720515 - 2¹⁴ = 704131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72047 + ... + 72056.

It is an arithmetic number, because the mean of its divisors is an integer number (216156).

2⁷²⁰⁵¹⁵ is an apocalyptic number.

720515 is a deficient number, since it is larger than the sum of its proper divisors (144109).

720515 is a wasteful number, since it uses less digits than its factorization.

720515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144108.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 720515 is about 848.8315498378. The cubic root of 720515 is about 89.6494594996.

The spelling of 720515 in words is "seven hundred twenty thousand, five hundred fifteen".