641538 has 24 divisors (see below), whose sum is σ = 1439100. Its totient is φ = 206304.

The previous prime is 641521. The next prime is 641549. The reversal of 641538 is 835146.

It can be written as a sum of positive squares in 2 ways, for example, as 567009 + 74529 = 753^2 + 273^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93 + ... + 1136.

2⁶⁴¹⁵³⁸ is an apocalyptic number.

641538 is an abundant number, since it is smaller than the sum of its proper divisors (797562).

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

641538 is a wasteful number, since it uses less digits than its factorization.

641538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1263 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 641538 is about 800.9606731919. The cubic root of 641538 is about 86.2463640559.

The spelling of 641538 in words is "six hundred forty-one thousand, five hundred thirty-eight".