720015 has 16 divisors (see below), whose sum is σ = 1202688. Its totient is φ = 367136.

The previous prime is 720007. The next prime is 720019. The reversal of 720015 is 510027.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 720015 - 2³ = 720007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

720015 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 719976 and 720003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 699 + ... + 1388.

It is an arithmetic number, because the mean of its divisors is an integer number (75168).

2⁷²⁰⁰¹⁵ is an apocalyptic number.

720015 is a deficient number, since it is larger than the sum of its proper divisors (482673).

720015 is a wasteful number, since it uses less digits than its factorization.

720015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118.

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 720015 is about 848.5369762126. The cubic root of 720015 is about 89.6287173441.

The spelling of 720015 in words is "seven hundred twenty thousand, fifteen".