723571643 has 4 divisors (see below), whose sum is σ = 725461248. Its totient is φ = 721682040.

The previous prime is 723571633. The next prime is 723571679. The reversal of 723571643 is 346175327.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 723571643 - 2¹² = 723567547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 723571597 and 723571606.

It is not an unprimeable number, because it can be changed into a prime (723571633) 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, 944228 + ... + 944993.

It is an arithmetic number, because the mean of its divisors is an integer number (181365312).

Almost surely, 2^723571643 is an apocalyptic number.

723571643 is a deficient number, since it is larger than the sum of its proper divisors (1889605).

723571643 is a wasteful number, since it uses less digits than its factorization.

723571643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889604.

The product of its digits is 105840, while the sum is 38.

The square root of 723571643 is about 26899.2870351614. The cubic root of 723571643 is about 897.7605404311.

The spelling of 723571643 in words is "seven hundred twenty-three million, five hundred seventy-one thousand, six hundred forty-three".