644070130 has 16 divisors (see below), whose sum is σ = 1264719744. Its totient is φ = 234207280.

The previous prime is 644070121. The next prime is 644070131. The reversal of 644070130 is 31070446.

It is a junction number, because it is equal to n+sod(n) for n = 644070095 and 644070104.

It is not an unprimeable number, because it can be changed into a prime (644070131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2927482 + ... + 2927701.

It is an arithmetic number, because the mean of its divisors is an integer number (79044984).

Almost surely, 2^644070130 is an apocalyptic number.

644070130 is a deficient number, since it is larger than the sum of its proper divisors (620649614).

644070130 is a wasteful number, since it uses less digits than its factorization.

644070130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5855201.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 644070130 is about 25378.5367978534. The cubic root of 644070130 is about 863.5968564249.

The spelling of 644070130 in words is "six hundred forty-four million, seventy thousand, one hundred thirty".