644046124 has 24 divisors (see below), whose sum is σ = 1177177680. Its totient is φ = 308005056.

The previous prime is 644046121. The next prime is 644046127. The reversal of 644046124 is 421640446.

644046124 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (644046121) and next prime (644046127).

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 7 ways as a sum of consecutive naturals, for example, 28147 + ... + 45610.

It is an arithmetic number, because the mean of its divisors is an integer number (49049070).

Almost surely, 2^644046124 is an apocalyptic number.

It is an amenable number.

644046124 is a deficient number, since it is larger than the sum of its proper divisors (533131556).

644046124 is a wasteful number, since it uses less digits than its factorization.

644046124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73857 (or 73855 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 644046124 is about 25378.0638347373. The cubic root of 644046124 is about 863.5861268668.

The spelling of 644046124 in words is "six hundred forty-four million, forty-six thousand, one hundred twenty-four".