644414 has 8 divisors (see below), whose sum is σ = 1008720. Its totient is φ = 308176.

The previous prime is 644411. The next prime is 644431. The reversal of 644414 is 414446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 644414.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6959 + ... + 7050.

It is an arithmetic number, because the mean of its divisors is an integer number (126090).

2⁶⁴⁴⁴¹⁴ is an apocalyptic number.

644414 is a deficient number, since it is larger than the sum of its proper divisors (364306).

644414 is a wasteful number, since it uses less digits than its factorization.

644414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14034.

The product of its digits is 1536, while the sum is 23.

The square root of 644414 is about 802.7540096443. The cubic root of 644414 is about 86.3750520963.

The spelling of 644414 in words is "six hundred forty-four thousand, four hundred fourteen".