825820818 has 16 divisors (see below), whose sum is σ = 1652135616. Its totient is φ = 275191280.

The previous prime is 825820813. The next prime is 825820829. The reversal of 825820818 is 818028528.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 825820818.

It is not an unprimeable number, because it can be changed into a prime (825820813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3280 + ... + 40772.

It is an arithmetic number, because the mean of its divisors is an integer number (103258476).

Almost surely, 2^825820818 is an apocalyptic number.

825820818 is an abundant number, since it is smaller than the sum of its proper divisors (826314798).

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

825820818 is a wasteful number, since it uses less digits than its factorization.

825820818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41169.

The product of its (nonzero) digits is 81920, while the sum is 42.

The square root of 825820818 is about 28737.0982877534. The cubic root of 825820818 is about 938.1996694125.

The spelling of 825820818 in words is "eight hundred twenty-five million, eight hundred twenty thousand, eight hundred eighteen".