6440644350 has 72 divisors (see below), whose sum is σ = 19775854800. Its totient is φ = 1472146560.

The previous prime is 6440644321. The next prime is 6440644373. The reversal of 6440644350 is 534460446.

6440644350 is a `hidden beast` number, since 6 + 4 + 4 + 0 + 644 + 3 + 5 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1019175 + ... + 1025474.

It is an arithmetic number, because the mean of its divisors is an integer number (274664650).

Almost surely, 2^6440644350 is an apocalyptic number.

6440644350 is an abundant number, since it is smaller than the sum of its proper divisors (13335210450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440644350 is a wasteful number, since it uses less digits than its factorization.

6440644350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044674 (or 2044666 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The square root of 6440644350 is about 80253.6251517650. The cubic root of 6440644350 is about 1860.5575418418.

The spelling of 6440644350 in words is "six billion, four hundred forty million, six hundred forty-four thousand, three hundred fifty".