720123313 has 16 divisors (see below), whose sum is σ = 932955520. Its totient is φ = 539778816.

The previous prime is 720123311. The next prime is 720123329. The reversal of 720123313 is 313321027.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 720123313 - 2¹ = 720123311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720123311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206520 + ... + 209977.

It is an arithmetic number, because the mean of its divisors is an integer number (58309720).

Almost surely, 2^720123313 is an apocalyptic number.

It is an amenable number.

720123313 is a deficient number, since it is larger than the sum of its proper divisors (212832207).

720123313 is a wasteful number, since it uses less digits than its factorization.

720123313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416536.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 720123313 is about 26835.1134337085. The cubic root of 720123313 is about 896.3321144890.

The spelling of 720123313 in words is "seven hundred twenty million, one hundred twenty-three thousand, three hundred thirteen".