644732047142 has 16 divisors (see below), whose sum is σ = 983013538464. Its totient is φ = 317061528000.

The previous prime is 644732047139. The next prime is 644732047187. The reversal of 644732047142 is 241740237446.

It is a super-2 number, since 2×644732047142² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644732047093 and 644732047102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1901642 + ... + 2214882.

It is an arithmetic number, because the mean of its divisors is an integer number (61438346154).

Almost surely, 2^644732047142 is an apocalyptic number.

644732047142 is a deficient number, since it is larger than the sum of its proper divisors (338281491322).

644732047142 is a wasteful number, since it uses less digits than its factorization.

644732047142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330175.

The product of its (nonzero) digits is 903168, while the sum is 44.

The spelling of 644732047142 in words is "six hundred forty-four billion, seven hundred thirty-two million, forty-seven thousand, one hundred forty-two".