720605615 has 8 divisors (see below), whose sum is σ = 871039440. Its totient is φ = 572276032.

The previous prime is 720605603. The next prime is 720605629. The reversal of 720605615 is 516506027.

It is a happy number.

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 720605615 - 2²⁰ = 719557039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525305 + ... + 526674.

It is an arithmetic number, because the mean of its divisors is an integer number (108879930).

Almost surely, 2^720605615 is an apocalyptic number.

720605615 is a deficient number, since it is larger than the sum of its proper divisors (150433825).

720605615 is a wasteful number, since it uses less digits than its factorization.

720605615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052121.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 720605615 is about 26844.0983271929. The cubic root of 720605615 is about 896.5321757323.

The spelling of 720605615 in words is "seven hundred twenty million, six hundred five thousand, six hundred fifteen".