641788 has 12 divisors (see below), whose sum is σ = 1283632. Its totient is φ = 275040.

The previous prime is 641761. The next prime is 641789. The reversal of 641788 is 887146.

It is a happy number.

641788 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11433 + ... + 11488.

2⁶⁴¹⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

641788 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

641788 is a wasteful number, since it uses less digits than its factorization.

641788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22932 (or 22930 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 641788 is about 801.1167205845. The cubic root of 641788 is about 86.2575656739.

The spelling of 641788 in words is "six hundred forty-one thousand, seven hundred eighty-eight".