720717628 has 12 divisors (see below), whose sum is σ = 1304747640. Its totient is φ = 347932592.

The previous prime is 720717607. The next prime is 720717649. The reversal of 720717628 is 826717027.

It is an interprime number because it is at equal distance from previous prime (720717607) and next prime (720717649).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3106426 + ... + 3106657.

It is an arithmetic number, because the mean of its divisors is an integer number (108728970).

Almost surely, 2^720717628 is an apocalyptic number.

It is an amenable number.

720717628 is a deficient number, since it is larger than the sum of its proper divisors (584030012).

720717628 is a wasteful number, since it uses less digits than its factorization.

720717628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6213116 (or 6213114 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 720717628 is about 26846.1846078731. The cubic root of 720717628 is about 896.5786265017.

The spelling of 720717628 in words is "seven hundred twenty million, seven hundred seventeen thousand, six hundred twenty-eight".