825645820 has 48 divisors (see below), whose sum is σ = 1760965920. Its totient is φ = 325124096.

The previous prime is 825645809. The next prime is 825645839. The reversal of 825645820 is 28546528.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 585276 + ... + 586684.

It is an arithmetic number, because the mean of its divisors is an integer number (36686790).

Almost surely, 2^825645820 is an apocalyptic number.

It is an amenable number.

825645820 is an abundant number, since it is smaller than the sum of its proper divisors (935320100).

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

825645820 is a wasteful number, since it uses less digits than its factorization.

825645820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854 (or 1852 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The square root of 825645820 is about 28734.0533165789. The cubic root of 825645820 is about 938.1333940734.

The spelling of 825645820 in words is "eight hundred twenty-five million, six hundred forty-five thousand, eight hundred twenty".