644374 has 8 divisors (see below), whose sum is σ = 984960. Its totient is φ = 316056.

The previous prime is 644363. The next prime is 644377. The reversal of 644374 is 473446.

644374 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644377) 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, 2934 + ... + 3145.

It is an arithmetic number, because the mean of its divisors is an integer number (123120).

2⁶⁴⁴³⁷⁴ is an apocalyptic number.

644374 is a deficient number, since it is larger than the sum of its proper divisors (340586).

644374 is a wasteful number, since it uses less digits than its factorization.

644374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6134.

The product of its digits is 8064, while the sum is 28.

The square root of 644374 is about 802.7290950252. The cubic root of 644374 is about 86.3732649048.

It can be divided in two parts, 64 and 4374, that multiplied together give a 7-th power (279936 = 6⁷).

The spelling of 644374 in words is "six hundred forty-four thousand, three hundred seventy-four".