720324673 has 4 divisors (see below), whose sum is σ = 722888388. Its totient is φ = 717760960.

The previous prime is 720324641. The next prime is 720324727. The reversal of 720324673 is 376423027.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 471410944 + 248913729 = 21712^2 + 15777^2 .

It is a cyclic number.

It is not a de Polignac number, because 720324673 - 2⁵ = 720324641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720324623) 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, 1281436 + ... + 1281997.

It is an arithmetic number, because the mean of its divisors is an integer number (180722097).

Almost surely, 2^720324673 is an apocalyptic number.

It is an amenable number.

720324673 is a deficient number, since it is larger than the sum of its proper divisors (2563715).

720324673 is a wasteful number, since it uses less digits than its factorization.

720324673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563714.

The product of its (nonzero) digits is 42336, while the sum is 34.

The square root of 720324673 is about 26838.8649722748. The cubic root of 720324673 is about 896.4156504666.

The spelling of 720324673 in words is "seven hundred twenty million, three hundred twenty-four thousand, six hundred seventy-three".