644530035446 has 32 divisors (see below), whose sum is σ = 1089071723520. Its totient is φ = 283422794400.

The previous prime is 644530035439. The next prime is 644530035469.

644530035446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644530035397 and 644530035406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1902440 + ... + 2215476.

It is an arithmetic number, because the mean of its divisors is an integer number (34033491360).

Almost surely, 2^644530035446 is an apocalyptic number.

644530035446 is a deficient number, since it is larger than the sum of its proper divisors (444541688074).

644530035446 is a wasteful number, since it uses less digits than its factorization.

644530035446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316100.

The product of its (nonzero) digits is 2073600, while the sum is 44.

The spelling of 644530035446 in words is "six hundred forty-four billion, five hundred thirty million, thirty-five thousand, four hundred forty-six".