720605311 has 4 divisors (see below), whose sum is σ = 745453800. Its totient is φ = 695756824.

The previous prime is 720605257. The next prime is 720605339. The reversal of 720605311 is 113506027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113506027 = 983 ⋅115469.

It is a cyclic number.

It is not a de Polignac number, because 720605311 - 2¹¹ = 720603263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720665311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12424201 + ... + 12424258.

It is an arithmetic number, because the mean of its divisors is an integer number (186363450).

Almost surely, 2^720605311 is an apocalyptic number.

720605311 is a deficient number, since it is larger than the sum of its proper divisors (24848489).

720605311 is a wasteful number, since it uses less digits than its factorization.

720605311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24848488.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 720605311 is about 26844.0926648676. The cubic root of 720605311 is about 896.5320496597.

The spelling of 720605311 in words is "seven hundred twenty million, six hundred five thousand, three hundred eleven".