641320 has 16 divisors (see below), whose sum is σ = 1443060. Its totient is φ = 256512.

The previous prime is 641317. The next prime is 641327. The reversal of 641320 is 23146.

It can be written as a sum of positive squares in 2 ways, for example, as 527076 + 114244 = 726^2 + 338^2 .

It is a super-2 number, since 2×641320² = 822582684800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641294 and 641303.

It is not an unprimeable number, because it can be changed into a prime (641327) 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, 7977 + ... + 8056.

2⁶⁴¹³²⁰ is an apocalyptic number.

It is an amenable number.

641320 is an abundant number, since it is smaller than the sum of its proper divisors (801740).

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

641320 is a wasteful number, since it uses less digits than its factorization.

641320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16044 (or 16040 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 641320 is about 800.8245750475. The cubic root of 641320 is about 86.2365938696.

Adding to 641320 its reverse (23146), we get a palindrome (664466).

It can be divided in two parts, 641 and 320, that multiplied together give a triangular number (205120 = T₆₄₀).

The spelling of 641320 in words is "six hundred forty-one thousand, three hundred twenty".