641278 has 16 divisors (see below), whose sum is σ = 1063296. Its totient is φ = 287640.

The previous prime is 641261. The next prime is 641279. The reversal of 641278 is 872146.

641278 is a nontrivial binomial coefficient, being equal to C(1133, 2).

It is a super-2 number, since 2×641278² = 822474946568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641279) 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, 2125 + ... + 2407.

It is an arithmetic number, because the mean of its divisors is an integer number (66456).

2⁶⁴¹²⁷⁸ is an apocalyptic number.

641278 is the 1132-nd triangular number.

641278 is the 378-th centered nonagonal number.

641278 is a deficient number, since it is larger than the sum of its proper divisors (422018).

641278 is a wasteful number, since it uses less digits than its factorization.

641278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399.

The product of its digits is 2688, while the sum is 28.

The square root of 641278 is about 800.7983516467. The cubic root of 641278 is about 86.2347112857.

It can be divided in two parts, 641 and 278, that added together give a palindrome (919).

The spelling of 641278 in words is "six hundred forty-one thousand, two hundred seventy-eight".