644530054 has 8 divisors (see below), whose sum is σ = 1104908688. Its totient is φ = 276227160.

The previous prime is 644530049. The next prime is 644530057. The reversal of 644530054 is 450035446.

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

It is a junction number, because it is equal to n+sod(n) for n = 644529998 and 644530025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644530057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23018917 + ... + 23018944.

It is an arithmetic number, because the mean of its divisors is an integer number (138113586).

Almost surely, 2^644530054 is an apocalyptic number.

644530054 is a deficient number, since it is larger than the sum of its proper divisors (460378634).

644530054 is a wasteful number, since it uses less digits than its factorization.

644530054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46037870.

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

The square root of 644530054 is about 25387.5964596887. The cubic root of 644530054 is about 863.8023694567.

The spelling of 644530054 in words is "six hundred forty-four million, five hundred thirty thousand, fifty-four".