723007643 has 4 divisors (see below), whose sum is σ = 724329960. Its totient is φ = 721685328.

The previous prime is 723007631. The next prime is 723007651. The reversal of 723007643 is 346700327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346700327 = 271 ⋅1279337.

It is a cyclic number.

It is not a de Polignac number, because 723007643 - 2¹⁰ = 723006619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723007843) 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, 660338 + ... + 661431.

It is an arithmetic number, because the mean of its divisors is an integer number (181082490).

Almost surely, 2^723007643 is an apocalyptic number.

723007643 is a deficient number, since it is larger than the sum of its proper divisors (1322317).

723007643 is a wasteful number, since it uses less digits than its factorization.

723007643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322316.

The product of its (nonzero) digits is 21168, while the sum is 32.

The square root of 723007643 is about 26888.8014422361. The cubic root of 723007643 is about 897.5272216509.

The spelling of 723007643 in words is "seven hundred twenty-three million, seven thousand, six hundred forty-three".