616720723 has 4 divisors (see below), whose sum is σ = 616771600. Its totient is φ = 616669848.

The previous prime is 616720721. The next prime is 616720733. The reversal of 616720723 is 327027616.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 616720723 - 2¹ = 616720721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616720721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4453 + ... + 35401.

It is an arithmetic number, because the mean of its divisors is an integer number (154192900).

Almost surely, 2^616720723 is an apocalyptic number.

616720723 is a deficient number, since it is larger than the sum of its proper divisors (50877).

616720723 is a wasteful number, since it uses less digits than its factorization.

616720723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50876.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 616720723 is about 24833.8624261310. The cubic root of 616720723 is about 851.1958820983.

The spelling of 616720723 in words is "six hundred sixteen million, seven hundred twenty thousand, seven hundred twenty-three".