641728134 has 48 divisors (see below), whose sum is σ = 1423217952. Its totient is φ = 208900224.

The previous prime is 641728133. The next prime is 641728141. The reversal of 641728134 is 431827146.

641728134 is a `hidden beast` number, since 641 + 7 + 2 + 8 + 1 + 3 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641728133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220839 + ... + 223725.

It is an arithmetic number, because the mean of its divisors is an integer number (29650374).

Almost surely, 2^641728134 is an apocalyptic number.

641728134 is an abundant number, since it is smaller than the sum of its proper divisors (781489818).

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

641728134 is a wasteful number, since it uses less digits than its factorization.

641728134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3181 (or 3178 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 641728134 is about 25332.3535029811. The cubic root of 641728134 is about 862.5488355461.

The spelling of 641728134 in words is "six hundred forty-one million, seven hundred twenty-eight thousand, one hundred thirty-four".