644127348 has 24 divisors (see below), whose sum is σ = 1591373952. Its totient is φ = 202079104.

The previous prime is 644127329. The next prime is 644127349. The reversal of 644127348 is 843721446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644127349) 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, 1578540 + ... + 1578947.

It is an arithmetic number, because the mean of its divisors is an integer number (66307248).

Almost surely, 2^644127348 is an apocalyptic number.

644127348 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

644127348 is an abundant number, since it is smaller than the sum of its proper divisors (947246604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644127348 is a wasteful number, since it uses less digits than its factorization.

644127348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157511 (or 3157509 counting only the distinct ones).

The product of its digits is 129024, while the sum is 39.

The square root of 644127348 is about 25379.6640639706. The cubic root of 644127348 is about 863.6224291172.

The spelling of 644127348 in words is "six hundred forty-four million, one hundred twenty-seven thousand, three hundred forty-eight".