646460723 has 4 divisors (see below), whose sum is σ = 652502520. Its totient is φ = 640418928.

The previous prime is 646460687. The next prime is 646460741. The reversal of 646460723 is 327064646.

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 646460723 - 2¹⁰ = 646459699 is a prime.

It is a super-2 number, since 2×646460723² = 835822932763365458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646460743) 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 3 ways as a sum of consecutive naturals, for example, 3020738 + ... + 3020951.

It is an arithmetic number, because the mean of its divisors is an integer number (163125630).

Almost surely, 2^646460723 is an apocalyptic number.

646460723 is a deficient number, since it is larger than the sum of its proper divisors (6041797).

646460723 is a wasteful number, since it uses less digits than its factorization.

646460723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6041796.

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 646460723 is about 25425.5918908489. The cubic root of 646460723 is about 864.6640070768.

The spelling of 646460723 in words is "six hundred forty-six million, four hundred sixty thousand, seven hundred twenty-three".