644261114 has 12 divisors (see below), whose sum is σ = 1124170074. Its totient is φ = 276111864.

The previous prime is 644261089. The next prime is 644261143. The reversal of 644261114 is 411162446.

It can be written as a sum of positive squares in only one way, i.e., 571449025 + 72812089 = 23905^2 + 8533^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3286949 + ... + 3287144.

Almost surely, 2^644261114 is an apocalyptic number.

644261114 is a deficient number, since it is larger than the sum of its proper divisors (479908960).

644261114 is a wasteful number, since it uses less digits than its factorization.

644261114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574109 (or 6574102 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 644261114 is about 25382.2992260355. The cubic root of 644261114 is about 863.6822078355.

The spelling of 644261114 in words is "six hundred forty-four million, two hundred sixty-one thousand, one hundred fourteen".