641632 has 12 divisors (see below), whose sum is σ = 1263276. Its totient is φ = 320800.

The previous prime is 641623. The next prime is 641633. The reversal of 641632 is 236146.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994 + ... + 10057.

It is an arithmetic number, because the mean of its divisors is an integer number (105273).

2⁶⁴¹⁶³² is an apocalyptic number.

It is an amenable number.

641632 is a deficient number, since it is larger than the sum of its proper divisors (621644).

641632 is a wasteful number, since it uses less digits than its factorization.

641632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20061 (or 20053 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 641632 is about 801.0193505777. The cubic root of 641632 is about 86.2505762056.

Adding to 641632 its reverse (236146), we get a palindrome (877778).

The spelling of 641632 in words is "six hundred forty-one thousand, six hundred thirty-two".