7821448 has 8 divisors (see below), whose sum is σ = 14665230. Its totient is φ = 3910720.

The previous prime is 7821427. The next prime is 7821461. The reversal of 7821448 is 8441287.

It can be written as a sum of positive squares in only one way, i.e., 7409284 + 412164 = 2722^2 + 642^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×7821448² = 122350097633408, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 488833 + ... + 488848.

Almost surely, 2^7821448 is an apocalyptic number.

It is an amenable number.

7821448 is a deficient number, since it is larger than the sum of its proper divisors (6843782).

7821448 is a wasteful number, since it uses less digits than its factorization.

7821448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977687 (or 977683 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 7821448 is about 2796.6851807095. The cubic root of 7821448 is about 198.5008576038.

The spelling of 7821448 in words is "seven million, eight hundred twenty-one thousand, four hundred forty-eight".