85821828 has 12 divisors (see below), whose sum is σ = 200250960. Its totient is φ = 28607272.

The previous prime is 85821781. The next prime is 85821829. The reversal of 85821828 is 82812858.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×85821828² = 14730772322523168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85821828.

It is not an unprimeable number, because it can be changed into a prime (85821829) 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, 3575898 + ... + 3575921.

It is an arithmetic number, because the mean of its divisors is an integer number (16687580).

Almost surely, 2^85821828 is an apocalyptic number.

It is an amenable number.

85821828 is an abundant number, since it is smaller than the sum of its proper divisors (114429132).

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

85821828 is a wasteful number, since it uses less digits than its factorization.

85821828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7151826 (or 7151824 counting only the distinct ones).

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

The square root of 85821828 is about 9264.0071243496. The cubic root of 85821828 is about 441.0954590995.

The spelling of 85821828 in words is "eighty-five million, eight hundred twenty-one thousand, eight hundred twenty-eight".