644543314 has 4 divisors (see below), whose sum is σ = 966814974. Its totient is φ = 322271656.

The previous prime is 644543311. The next prime is 644543323. The reversal of 644543314 is 413345446.

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

It can be written as a sum of positive squares in only one way, i.e., 639331225 + 5212089 = 25285^2 + 2283^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 644543314.

It is not an unprimeable number, because it can be changed into a prime (644543311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161135827 + ... + 161135830.

Almost surely, 2^644543314 is an apocalyptic number.

644543314 is a deficient number, since it is larger than the sum of its proper divisors (322271660).

644543314 is a wasteful number, since it uses less digits than its factorization.

644543314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322271659.

The product of its digits is 69120, while the sum is 34.

The square root of 644543314 is about 25387.8576094951. The cubic root of 644543314 is about 863.8082931219.

The spelling of 644543314 in words is "six hundred forty-four million, five hundred forty-three thousand, three hundred fourteen".