641634 has 16 divisors (see below), whose sum is σ = 1466688. Its totient is φ = 183312.

The previous prime is 641633. The next prime is 641639. The reversal of 641634 is 436146.

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 in 7 ways as a sum of consecutive naturals, for example, 7597 + ... + 7680.

It is an arithmetic number, because the mean of its divisors is an integer number (91668).

2⁶⁴¹⁶³⁴ is an apocalyptic number.

641634 is an abundant number, since it is smaller than the sum of its proper divisors (825054).

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

641634 is a wasteful number, since it uses less digits than its factorization.

641634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15289.

The product of its digits is 1728, while the sum is 24.

The square root of 641634 is about 801.0205989861. The cubic root of 641634 is about 86.2506658214.

It can be divided in two parts, 64163 and 4, that multiplied together give a palindrome (256652).

The spelling of 641634 in words is "six hundred forty-one thousand, six hundred thirty-four".