646776327 has 4 divisors (see below), whose sum is σ = 862368440. Its totient is φ = 431184216.

The previous prime is 646776323. The next prime is 646776371. The reversal of 646776327 is 723677646.

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

It is not a de Polignac number, because 646776327 - 2² = 646776323 is a prime.

It is a super-3 number, since 3×646776327³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646776323) 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, 107796052 + ... + 107796057.

It is an arithmetic number, because the mean of its divisors is an integer number (215592110).

Almost surely, 2^646776327 is an apocalyptic number.

646776327 is a deficient number, since it is larger than the sum of its proper divisors (215592113).

646776327 is a wasteful number, since it uses less digits than its factorization.

646776327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215592112.

The product of its digits is 1778112, while the sum is 48.

The square root of 646776327 is about 25431.7975573887. The cubic root of 646776327 is about 864.8046946767.

The spelling of 646776327 in words is "six hundred forty-six million, seven hundred seventy-six thousand, three hundred twenty-seven".