723956166728 has 16 divisors (see below), whose sum is σ = 1372669699500. Its totient is φ = 357910913536.

The previous prime is 723956166727. The next prime is 723956166737. The reversal of 723956166728 is 827661659327.

It can be written as a sum of positive squares in 2 ways, for example, as 696153272164 + 27802894564 = 834358^2 + 166742^2 .

It is a super-2 number, since 2×723956166728² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (723956166727) 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, 508395473 + ... + 508396896.

Almost surely, 2^723956166728 is an apocalyptic number.

It is an amenable number.

723956166728 is a deficient number, since it is larger than the sum of its proper divisors (648713532772).

723956166728 is a wasteful number, since it uses less digits than its factorization.

723956166728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016792464 (or 1016792460 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 62.

The spelling of 723956166728 in words is "seven hundred twenty-three billion, nine hundred fifty-six million, one hundred sixty-six thousand, seven hundred twenty-eight".