644413742 has 8 divisors (see below), whose sum is σ = 1104709296. Its totient is φ = 276177312.

The previous prime is 644413739. The next prime is 644413751. The reversal of 644413742 is 247314446.

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

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, 23014763 + ... + 23014790.

It is an arithmetic number, because the mean of its divisors is an integer number (138088662).

Almost surely, 2^644413742 is an apocalyptic number.

644413742 is a deficient number, since it is larger than the sum of its proper divisors (460295554).

644413742 is a wasteful number, since it uses less digits than its factorization.

644413742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46029562.

The product of its digits is 64512, while the sum is 35.

The square root of 644413742 is about 25385.3056314081. The cubic root of 644413742 is about 863.7504056913.

The spelling of 644413742 in words is "six hundred forty-four million, four hundred thirteen thousand, seven hundred forty-two".