644350454 has 8 divisors (see below), whose sum is σ = 1054391688. Its totient is φ = 292886560.

The previous prime is 644350429. The next prime is 644350501. The reversal of 644350454 is 454053446.

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

It is a super-2 number, since 2×644350454² = 830375015140012232, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14644307 + ... + 14644350.

It is an arithmetic number, because the mean of its divisors is an integer number (131798961).

Almost surely, 2^644350454 is an apocalyptic number.

644350454 is a deficient number, since it is larger than the sum of its proper divisors (410041234).

644350454 is a wasteful number, since it uses less digits than its factorization.

644350454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29288670.

The product of its (nonzero) digits is 115200, while the sum is 35.

The square root of 644350454 is about 25384.0590528780. The cubic root of 644350454 is about 863.7221284000.

The spelling of 644350454 in words is "six hundred forty-four million, three hundred fifty thousand, four hundred fifty-four".