646367723 has 4 divisors (see below), whose sum is σ = 646455720. Its totient is φ = 646279728.

The previous prime is 646367717. The next prime is 646367737. The reversal of 646367723 is 327763646.

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 646367723 - 2¹⁶ = 646302187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646367713) 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, 31865 + ... + 48042.

It is an arithmetic number, because the mean of its divisors is an integer number (161613930).

Almost surely, 2^646367723 is an apocalyptic number.

646367723 is a deficient number, since it is larger than the sum of its proper divisors (87997).

646367723 is an equidigital number, since it uses as much as digits as its factorization.

646367723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87996.

The product of its digits is 762048, while the sum is 44.

The square root of 646367723 is about 25423.7629590901. The cubic root of 646367723 is about 864.6225414955.

The spelling of 646367723 in words is "six hundred forty-six million, three hundred sixty-seven thousand, seven hundred twenty-three".