643617327 has 4 divisors (see below), whose sum is σ = 858156440. Its totient is φ = 429078216.

The previous prime is 643617323. The next prime is 643617353. The reversal of 643617327 is 723716346.

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

It is not a de Polignac number, because 643617327 - 2² = 643617323 is a prime.

It is a super-2 number, since 2×643617327² = 828486527229249858, 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 (643617323) 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, 107269552 + ... + 107269557.

It is an arithmetic number, because the mean of its divisors is an integer number (214539110).

Almost surely, 2^643617327 is an apocalyptic number.

643617327 is a deficient number, since it is larger than the sum of its proper divisors (214539113).

643617327 is a wasteful number, since it uses less digits than its factorization.

643617327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214539112.

The product of its digits is 127008, while the sum is 39.

The square root of 643617327 is about 25369.6142461804. The cubic root of 643617327 is about 863.3944297518.

The spelling of 643617327 in words is "six hundred forty-three million, six hundred seventeen thousand, three hundred twenty-seven".