723636641 has 32 divisors (see below), whose sum is σ = 944563200. Its totient is φ = 538332480.

The previous prime is 723636629. The next prime is 723636643. The reversal of 723636641 is 146636327.

It is not a de Polignac number, because 723636641 - 2²² = 719442337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 723636595 and 723636604.

It is not an unprimeable number, because it can be changed into a prime (723636643) 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 31 ways as a sum of consecutive naturals, for example, 238826 + ... + 241836.

It is an arithmetic number, because the mean of its divisors is an integer number (29517600).

Almost surely, 2^723636641 is an apocalyptic number.

It is an amenable number.

723636641 is a deficient number, since it is larger than the sum of its proper divisors (220926559).

723636641 is a wasteful number, since it uses less digits than its factorization.

723636641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189.

The product of its digits is 108864, while the sum is 38.

The square root of 723636641 is about 26900.4951813159. The cubic root of 723636641 is about 897.7874213871.

The spelling of 723636641 in words is "seven hundred twenty-three million, six hundred thirty-six thousand, six hundred forty-one".