6488821 has 4 divisors (see below), whose sum is σ = 6493932. Its totient is φ = 6483712.

The previous prime is 6488819. The next prime is 6488831. The reversal of 6488821 is 1288846.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3802500 + 2686321 = 1950^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 6488821 - 2¹ = 6488819 is a prime.

It is a Duffinian number.

6488821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6488831) by changing a digit.

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, 981 + ... + 3733.

It is an arithmetic number, because the mean of its divisors is an integer number (1623483).

Almost surely, 2^6488821 is an apocalyptic number.

It is an amenable number.

6488821 is a deficient number, since it is larger than the sum of its proper divisors (5111).

6488821 is a wasteful number, since it uses less digits than its factorization.

6488821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5110.

The product of its digits is 24576, while the sum is 37.

The square root of 6488821 is about 2547.3164310702. The cubic root of 6488821 is about 186.5185073647.

The spelling of 6488821 in words is "six million, four hundred eighty-eight thousand, eight hundred twenty-one".