644676627 has 8 divisors (see below), whose sum is σ = 982364416. Its totient is φ = 368386632.

The previous prime is 644676611. The next prime is 644676629. The reversal of 644676627 is 726676446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 644676627 - 2⁴ = 644676611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644676629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15349423 + ... + 15349464.

It is an arithmetic number, because the mean of its divisors is an integer number (122795552).

Almost surely, 2^644676627 is an apocalyptic number.

644676627 is a deficient number, since it is larger than the sum of its proper divisors (337687789).

644676627 is a wasteful number, since it uses less digits than its factorization.

644676627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30698897.

The product of its digits is 2032128, while the sum is 48.

The square root of 644676627 is about 25390.4830005260. The cubic root of 644676627 is about 863.8678437805.

The spelling of 644676627 in words is "six hundred forty-four million, six hundred seventy-six thousand, six hundred twenty-seven".