641772 has 18 divisors (see below), whose sum is σ = 1622348. Its totient is φ = 213912.

The previous prime is 641761. The next prime is 641789. The reversal of 641772 is 277146.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8878 + ... + 8949.

2⁶⁴¹⁷⁷² is an apocalyptic number.

It is an amenable number.

641772 is an abundant number, since it is smaller than the sum of its proper divisors (980576).

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

641772 is a wasteful number, since it uses less digits than its factorization.

641772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17837 (or 17832 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 641772 is about 801.1067344618. The cubic root of 641772 is about 86.2568488575.

The spelling of 641772 in words is "six hundred forty-one thousand, seven hundred seventy-two".