720605618 has 8 divisors (see below), whose sum is σ = 1081098012. Its totient is φ = 360239616.

The previous prime is 720605603. The next prime is 720605629. The reversal of 720605618 is 816506027.

It can be written as a sum of positive squares in 2 ways, for example, as 710062609 + 10543009 = 26647^2 + 3247^2 .

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

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, 15755 + ... + 41102.

Almost surely, 2^720605618 is an apocalyptic number.

720605618 is a deficient number, since it is larger than the sum of its proper divisors (360492394).

720605618 is a wasteful number, since it uses less digits than its factorization.

720605618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63196.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 720605618 is about 26844.0983830711. The cubic root of 720605618 is about 896.5321769764.

The spelling of 720605618 in words is "seven hundred twenty million, six hundred five thousand, six hundred eighteen".