6513820 has 12 divisors (see below), whose sum is σ = 13679064. Its totient is φ = 2605520.

The previous prime is 6513817. The next prime is 6513847. The reversal of 6513820 is 283156.

It is a happy number.

6513820 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 162826 + ... + 162865.

It is an arithmetic number, because the mean of its divisors is an integer number (1139922).

Almost surely, 2^6513820 is an apocalyptic number.

It is an amenable number.

6513820 is an abundant number, since it is smaller than the sum of its proper divisors (7165244).

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

6513820 is a wasteful number, since it uses less digits than its factorization.

6513820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325700 (or 325698 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 6513820 is about 2552.2186426715. The cubic root of 6513820 is about 186.7577290955.

Adding to 6513820 its reverse (283156), we get a palindrome (6796976).

The spelling of 6513820 in words is "six million, five hundred thirteen thousand, eight hundred twenty".