641886344 has 16 divisors (see below), whose sum is σ = 1312949520. Its totient is φ = 291766480.

The previous prime is 641886307. The next prime is 641886373. The reversal of 641886344 is 443688146.

It is a super-3 number, since 3×641886344³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 641886295 and 641886304.

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, 3646994 + ... + 3647169.

It is an arithmetic number, because the mean of its divisors is an integer number (82059345).

Almost surely, 2^641886344 is an apocalyptic number.

It is an amenable number.

641886344 is an abundant number, since it is smaller than the sum of its proper divisors (671063176).

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

641886344 is a wasteful number, since it uses less digits than its factorization.

641886344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7294180 (or 7294176 counting only the distinct ones).

The product of its digits is 442368, while the sum is 44.

The square root of 641886344 is about 25335.4759971073. The cubic root of 641886344 is about 862.6197132440.

The spelling of 641886344 in words is "six hundred forty-one million, eight hundred eighty-six thousand, three hundred forty-four".