723643641 has 96 divisors (see below), whose sum is σ = 1366709760. Its totient is φ = 359073792.

The previous prime is 723643639. The next prime is 723643667. The reversal of 723643641 is 146346327.

It is a happy number.

723643641 is a `hidden beast` number, since 7 + 2 + 3 + 6 + 4 + 3 + 641 = 666.

It is not a de Polignac number, because 723643641 - 2¹ = 723643639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 723643596 and 723643605.

It is not an unprimeable number, because it can be changed into a prime (723643691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 713851 + ... + 714863.

It is an arithmetic number, because the mean of its divisors is an integer number (14236560).

Almost surely, 2^723643641 is an apocalyptic number.

It is an amenable number.

723643641 is a deficient number, since it is larger than the sum of its proper divisors (643066119).

723643641 is a wasteful number, since it uses less digits than its factorization.

723643641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1092 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 723643641 is about 26900.6252901303. The cubic root of 723643641 is about 897.7903162523.

Adding to 723643641 its reverse (146346327), we get a palindrome (869989968).

The spelling of 723643641 in words is "seven hundred twenty-three million, six hundred forty-three thousand, six hundred forty-one".