85812820 has 12 divisors (see below), whose sum is σ = 180206964. Its totient is φ = 34325120.

The previous prime is 85812799. The next prime is 85812829. The reversal of 85812820 is 2821858.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 67305616 + 18507204 = 8204^2 + 4302^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85812829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145301 + ... + 2145340.

It is an arithmetic number, because the mean of its divisors is an integer number (15017247).

Almost surely, 2^85812820 is an apocalyptic number.

It is an amenable number.

85812820 is an abundant number, since it is smaller than the sum of its proper divisors (94394144).

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

85812820 is a wasteful number, since it uses less digits than its factorization.

85812820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290650 (or 4290648 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 85812820 is about 9263.5209288909. The cubic root of 85812820 is about 441.0800258582.

The spelling of 85812820 in words is "eighty-five million, eight hundred twelve thousand, eight hundred twenty".