644354 has 8 divisors (see below), whose sum is σ = 975888. Its totient is φ = 319060.

The previous prime is 644353. The next prime is 644359. The reversal of 644354 is 453446.

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

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (644353) 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, 1292 + ... + 1719.

It is an arithmetic number, because the mean of its divisors is an integer number (121986).

2⁶⁴⁴³⁵⁴ is an apocalyptic number.

644354 is a deficient number, since it is larger than the sum of its proper divisors (331534).

644354 is a wasteful number, since it uses less digits than its factorization.

644354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120.

The product of its digits is 5760, while the sum is 26.

The square root of 644354 is about 802.7166374257. The cubic root of 644354 is about 86.3723712814.

The spelling of 644354 in words is "six hundred forty-four thousand, three hundred fifty-four".