644046125 has 16 divisors (see below), whose sum is σ = 811589376. Its totient is φ = 510224400.

The previous prime is 644046121. The next prime is 644046127. The reversal of 644046125 is 521640446.

It is not a de Polignac number, because 644046125 - 2² = 644046121 is a prime.

It is a super-2 number, since 2×644046125² = 829590822255031250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 644046091 and 644046100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644046121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12137 + ... + 37886.

It is an arithmetic number, because the mean of its divisors is an integer number (50724336).

Almost surely, 2^644046125 is an apocalyptic number.

It is an amenable number.

644046125 is a deficient number, since it is larger than the sum of its proper divisors (167543251).

644046125 is a wasteful number, since it uses less digits than its factorization.

644046125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50141 (or 50131 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 644046125 is about 25378.0638544393. The cubic root of 644046125 is about 863.5861273138.

The spelling of 644046125 in words is "six hundred forty-four million, forty-six thousand, one hundred twenty-five".