644845006350 has 72 divisors (see below), whose sum is σ = 1732810189032. Its totient is φ = 171926251200.

The previous prime is 644845006331. The next prime is 644845006367. The reversal of 644845006350 is 53600548446.

644845006350 is a `hidden beast` number, since 6 + 4 + 4 + 8 + 4 + 5 + 0 + 0 + 635 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 644845006296 and 644845006305.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2303485 + ... + 2568215.

It is an arithmetic number, because the mean of its divisors is an integer number (24066808181).

Almost surely, 2^644845006350 is an apocalyptic number.

644845006350 is an abundant number, since it is smaller than the sum of its proper divisors (1087965182682).

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

644845006350 is a wasteful number, since it uses less digits than its factorization.

644845006350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270162 (or 270154 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 644845006350 in words is "six hundred forty-four billion, eight hundred forty-five million, six thousand, three hundred fifty".