646227773 has 4 divisors (see below), whose sum is σ = 661989468. Its totient is φ = 630466080.

The previous prime is 646227761. The next prime is 646227809. The reversal of 646227773 is 377722646.

646227773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 208455844 + 437771929 = 14438^2 + 20923^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646227773 is a prime.

It is a super-2 number, since 2×646227773² = 835220669193079058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646227173) 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, 7880786 + ... + 7880867.

It is an arithmetic number, because the mean of its divisors is an integer number (165497367).

Almost surely, 2^646227773 is an apocalyptic number.

It is an amenable number.

646227773 is a deficient number, since it is larger than the sum of its proper divisors (15761695).

646227773 is a wasteful number, since it uses less digits than its factorization.

646227773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15761694.

The product of its digits is 592704, while the sum is 44.

The square root of 646227773 is about 25421.0104637876. The cubic root of 646227773 is about 864.5601349867.

The spelling of 646227773 in words is "six hundred forty-six million, two hundred twenty-seven thousand, seven hundred seventy-three".