644171124 has 12 divisors (see below), whose sum is σ = 1503065984. Its totient is φ = 214723704.

The previous prime is 644171093. The next prime is 644171161. The reversal of 644171124 is 421171446.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 644171091 and 644171100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26840452 + ... + 26840475.

Almost surely, 2^644171124 is an apocalyptic number.

It is an amenable number.

644171124 is an abundant number, since it is smaller than the sum of its proper divisors (858894860).

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

644171124 is a wasteful number, since it uses less digits than its factorization.

644171124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53680934 (or 53680932 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 644171124 is about 25380.5264720809. The cubic root of 644171124 is about 863.6419930948.

The spelling of 644171124 in words is "six hundred forty-four million, one hundred seventy-one thousand, one hundred twenty-four".