644616350 has 96 divisors (see below), whose sum is σ = 1453032000. Its totient is φ = 208051200.

The previous prime is 644616347. The next prime is 644616383. The reversal of 644616350 is 53616446.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 644616350.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 415376 + ... + 416924.

It is an arithmetic number, because the mean of its divisors is an integer number (15135750).

Almost surely, 2^644616350 is an apocalyptic number.

644616350 is an abundant number, since it is smaller than the sum of its proper divisors (808415650).

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

644616350 is a wasteful number, since it uses less digits than its factorization.

644616350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 644616350 is about 25389.2959729095. The cubic root of 644616350 is about 863.8409191784.

It can be divided in two parts, 644 and 616350, that multiplied together give a triangular number (396929400 = T₂₈₁₇₅).

The spelling of 644616350 in words is "six hundred forty-four million, six hundred sixteen thousand, three hundred fifty".