720721023 has 16 divisors (see below), whose sum is σ = 1049068800. Its totient is φ = 436489280.

The previous prime is 720721019. The next prime is 720721033. The reversal of 720721023 is 320127027.

It is a cyclic number.

It is not a de Polignac number, because 720721023 - 2² = 720721019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 720720984 and 720721002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720721013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44443 + ... + 58451.

It is an arithmetic number, because the mean of its divisors is an integer number (65566800).

Almost surely, 2^720721023 is an apocalyptic number.

720721023 is a deficient number, since it is larger than the sum of its proper divisors (328347777).

720721023 is a wasteful number, since it uses less digits than its factorization.

720721023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15582.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 720721023 is about 26846.2478383852. The cubic root of 720721023 is about 896.5800343020.

The spelling of 720721023 in words is "seven hundred twenty million, seven hundred twenty-one thousand, twenty-three".