641790 has 32 divisors (see below), whose sum is σ = 1712160. Its totient is φ = 171072.

The previous prime is 641789. The next prime is 641791. The reversal of 641790 is 97146.

It is an interprime number because it is at equal distance from previous prime (641789) and next prime (641791).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919 + ... + 1458.

It is an arithmetic number, because the mean of its divisors is an integer number (53505).

2⁶⁴¹⁷⁹⁰ is an apocalyptic number.

641790 is an abundant number, since it is smaller than the sum of its proper divisors (1070370).

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

641790 is a wasteful number, since it uses less digits than its factorization.

641790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393 (or 2387 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 641790 is about 801.1179688410. The cubic root of 641790 is about 86.2576552752.

Subtracting from 641790 its reverse (97146), we obtain a square (544644 = 738²).

It can be divided in two parts, 641 and 790, that added together give a triangular number (1431 = T₅₃).

The spelling of 641790 in words is "six hundred forty-one thousand, seven hundred ninety".