644154 has 32 divisors (see below), whose sum is σ = 1507200. Its totient is φ = 183456.

The previous prime is 644153. The next prime is 644159. The reversal of 644154 is 451446.

644154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (644153) 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, 1902 + ... + 2214.

It is an arithmetic number, because the mean of its divisors is an integer number (47100).

2⁶⁴⁴¹⁵⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753600).

644154 is an abundant number, since it is smaller than the sum of its proper divisors (863046).

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

644154 is a wasteful number, since it uses less digits than its factorization.

644154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 325 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 644154 is about 802.5920507954. The cubic root of 644154 is about 86.3634340296.

The spelling of 644154 in words is "six hundred forty-four thousand, one hundred fifty-four".