723717712656 has 105 divisors (see below), whose sum is σ = 2102609802181. Its totient is φ = 241208611776.

The previous prime is 723717712633. The next prime is 723717712657. The reversal of 723717712656 is 656217717327.

The square root of 723717712656 is 850716.

It is a perfect power (a square), and thus also a powerful number.

723717712656 is a `hidden beast` number, since 7 + 2 + 371 + 7 + 7 + 1 + 265 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 110290410000 + 613427302656 = 332100^2 + 783216^2 .

It is a super-2 number, since 2×723717712656² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723717712657) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 91873390 + ... + 91881266.

Almost surely, 2^723717712656 is an apocalyptic number.

723717712656 is the 850716-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 723717712656

723717712656 is an abundant number, since it is smaller than the sum of its proper divisors (1378892089525).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

723717712656 is an frugal number, since it uses more digits than its factorization.

723717712656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15780 (or 7882 counting only the distinct ones).

The product of its digits is 5186160, while the sum is 54.

The spelling of 723717712656 in words is "seven hundred twenty-three billion, seven hundred seventeen million, seven hundred twelve thousand, six hundred fifty-six".