644450295 has 16 divisors (see below), whose sum is σ = 1032317280. Its totient is φ = 343307904.

The previous prime is 644450293. The next prime is 644450309. The reversal of 644450295 is 592054446.

It is a happy number.

It is not a de Polignac number, because 644450295 - 2¹ = 644450293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644450293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11340 + ... + 37649.

It is an arithmetic number, because the mean of its divisors is an integer number (64519830).

Almost surely, 2^644450295 is an apocalyptic number.

644450295 is a deficient number, since it is larger than the sum of its proper divisors (387866985).

644450295 is a wasteful number, since it uses less digits than its factorization.

644450295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49874.

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 644450295 is about 25386.0255849552. The cubic root of 644450295 is about 863.7667368513.

The spelling of 644450295 in words is "six hundred forty-four million, four hundred fifty thousand, two hundred ninety-five".