641217144 has 128 divisors (see below), whose sum is σ = 1733529600. Its totient is φ = 197191680.

The previous prime is 641217107. The next prime is 641217151. The reversal of 641217144 is 441712146.

It is a super-2 number, since 2×641217144² = 822318851519033472, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 2437957 + ... + 2438219.

It is an arithmetic number, because the mean of its divisors is an integer number (13543200).

Almost surely, 2^641217144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641217144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (866764800).

641217144 is an abundant number, since it is smaller than the sum of its proper divisors (1092312456).

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

641217144 is a wasteful number, since it uses less digits than its factorization.

641217144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 441 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 641217144 is about 25322.2657754001. The cubic root of 641217144 is about 862.3198336555.

The spelling of 641217144 in words is "six hundred forty-one million, two hundred seventeen thousand, one hundred forty-four".