644524228714 has 12 divisors (see below), whose sum is σ = 987793929954. Its totient is φ = 315405471464.

The previous prime is 644524228697. The next prime is 644524228717. The reversal of 644524228714 is 417822425446.

It can be written as a sum of positive squares in only one way, i.e., 448879900225 + 195644328489 = 669985^2 + 442317^2 .

It is a super-2 number, since 2×644524228714² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (644524228717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72938569 + ... + 72947404.

Almost surely, 2^644524228714 is an apocalyptic number.

644524228714 is a deficient number, since it is larger than the sum of its proper divisors (343269701240).

644524228714 is a wasteful number, since it uses less digits than its factorization.

644524228714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145886069 (or 145886022 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 49.

The spelling of 644524228714 in words is "six hundred forty-four billion, five hundred twenty-four million, two hundred twenty-eight thousand, seven hundred fourteen".