644101074 has 96 divisors (see below), whose sum is σ = 1485619200. Its totient is φ = 201398400.

The previous prime is 644101067. The next prime is 644101079. The reversal of 644101074 is 470101446.

644101074 is a `hidden beast` number, since 644 + 1 + 0 + 10 + 7 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (644101079) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4322752 + ... + 4322900.

It is an arithmetic number, because the mean of its divisors is an integer number (15475200).

Almost surely, 2^644101074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644101074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742809600).

644101074 is an abundant number, since it is smaller than the sum of its proper divisors (841518126).

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

644101074 is a wasteful number, since it uses less digits than its factorization.

644101074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 644101074 is about 25379.1464395476. The cubic root of 644101074 is about 863.6106865510.

The spelling of 644101074 in words is "six hundred forty-four million, one hundred one thousand, seventy-four".