644097 has 8 divisors (see below), whose sum is σ = 878944. Its totient is φ = 419328.

The previous prime is 644089. The next prime is 644101. The reversal of 644097 is 790446.

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

It is not a de Polignac number, because 644097 - 2³ = 644089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2368 + ... + 2625.

It is an arithmetic number, because the mean of its divisors is an integer number (109868).

It is a Proth number, since it is equal to 629 ⋅ 2¹⁰ + 1 and 629 < 2¹⁰.

2⁶⁴⁴⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

644097 is a deficient number, since it is larger than the sum of its proper divisors (234847).

644097 is a wasteful number, since it uses less digits than its factorization.

644097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 644097 is about 802.5565400643. The cubic root of 644097 is about 86.3608865741.

The spelling of 644097 in words is "six hundred forty-four thousand, ninety-seven".