644262130 has 16 divisors (see below), whose sum is σ = 1191015000. Its totient is φ = 250739712.

The previous prime is 644262103. The next prime is 644262137. The reversal of 644262130 is 31262446.

644262130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 511528689 + 132733441 = 22617^2 + 11521^2 .

It is not an unprimeable number, because it can be changed into a prime (644262137) 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, 870255 + ... + 870994.

Almost surely, 2^644262130 is an apocalyptic number.

644262130 is a deficient number, since it is larger than the sum of its proper divisors (546752870).

644262130 is a wasteful number, since it uses less digits than its factorization.

644262130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741293.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 644262130 is about 25382.3192399749. The cubic root of 644262130 is about 863.6826618443.

The spelling of 644262130 in words is "six hundred forty-four million, two hundred sixty-two thousand, one hundred thirty".