720864947 has 4 divisors (see below), whose sum is σ = 786398136. Its totient is φ = 655331760.

The previous prime is 720864941. The next prime is 720864971. The reversal of 720864947 is 749468027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720864947 - 2⁴ = 720864931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720864941) 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, 32766578 + ... + 32766599.

It is an arithmetic number, because the mean of its divisors is an integer number (196599534).

Almost surely, 2^720864947 is an apocalyptic number.

720864947 is a deficient number, since it is larger than the sum of its proper divisors (65533189).

720864947 is a wasteful number, since it uses less digits than its factorization.

720864947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65533188.

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 720864947 is about 26848.9282281435. The cubic root of 720864947 is about 896.6397110203.

The spelling of 720864947 in words is "seven hundred twenty million, eight hundred sixty-four thousand, nine hundred forty-seven".