821604025 has 12 divisors (see below), whose sum is σ = 1111406544. Its totient is φ = 597530000.

The previous prime is 821604013. The next prime is 821604037. The reversal of 821604025 is 520406128.

821604025 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (821604013) and next prime (821604037).

It is not a de Polignac number, because 821604025 - 2¹³ = 821595833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 821603984 and 821604002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1493551 + ... + 1494100.

It is an arithmetic number, because the mean of its divisors is an integer number (92617212).

Almost surely, 2^821604025 is an apocalyptic number.

It is an amenable number.

821604025 is a deficient number, since it is larger than the sum of its proper divisors (289802519).

821604025 is a wasteful number, since it uses less digits than its factorization.

821604025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987672 (or 2987667 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 821604025 is about 28663.6359347519. The cubic root of 821604025 is about 936.6000703374.

The spelling of 821604025 in words is "eight hundred twenty-one million, six hundred four thousand, twenty-five".