644305054 has 8 divisors (see below), whose sum is σ = 997633728. Its totient is φ = 311760480.

The previous prime is 644305021. The next prime is 644305063. The reversal of 644305054 is 450503446.

644305054 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 super-3 number, since 3×644305054³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5195947 + ... + 5196070.

It is an arithmetic number, because the mean of its divisors is an integer number (124704216).

Almost surely, 2^644305054 is an apocalyptic number.

644305054 is a deficient number, since it is larger than the sum of its proper divisors (353328674).

644305054 is a wasteful number, since it uses less digits than its factorization.

644305054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10392050.

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 644305054 is about 25383.1647751024. The cubic root of 644305054 is about 863.7018423867.

The spelling of 644305054 in words is "six hundred forty-four million, three hundred five thousand, fifty-four".