720711645 has 32 divisors (see below), whose sum is σ = 1177912704. Its totient is φ = 376185600.

The previous prime is 720711643. The next prime is 720711679. The reversal of 720711645 is 546117027.

It is not a de Polignac number, because 720711645 - 2¹ = 720711643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720711643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191199 + ... + 194931.

It is an arithmetic number, because the mean of its divisors is an integer number (36809772).

Almost surely, 2^720711645 is an apocalyptic number.

It is an amenable number.

720711645 is a deficient number, since it is larger than the sum of its proper divisors (457201059).

720711645 is a wasteful number, since it uses less digits than its factorization.

720711645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 720711645 is about 26846.0731765374. The cubic root of 720711645 is about 896.5761455278.

The spelling of 720711645 in words is "seven hundred twenty million, seven hundred eleven thousand, six hundred forty-five".