644124414 has 16 divisors (see below), whose sum is σ = 1292804352. Its totient is φ = 213948888.

The previous prime is 644124409. The next prime is 644124427. The reversal of 644124414 is 414421446.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 187974 + ... + 191369.

It is an arithmetic number, because the mean of its divisors is an integer number (80800272).

Almost surely, 2^644124414 is an apocalyptic number.

644124414 is an abundant number, since it is smaller than the sum of its proper divisors (648679938).

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

644124414 is a wasteful number, since it uses less digits than its factorization.

644124414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379631.

The product of its digits is 12288, while the sum is 30.

The square root of 644124414 is about 25379.6062617212. The cubic root of 644124414 is about 863.6211178486.

The spelling of 644124414 in words is "six hundred forty-four million, one hundred twenty-four thousand, four hundred fourteen".