85389820 has 12 divisors (see below), whose sum is σ = 179318664. Its totient is φ = 34155920.

The previous prime is 85389809. The next prime is 85389853. The reversal of 85389820 is 2898358.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134726 + ... + 2134765.

It is an arithmetic number, because the mean of its divisors is an integer number (14943222).

Almost surely, 2^85389820 is an apocalyptic number.

It is an amenable number.

85389820 is an abundant number, since it is smaller than the sum of its proper divisors (93928844).

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

85389820 is a wasteful number, since it uses less digits than its factorization.

85389820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4269500 (or 4269498 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 85389820 is about 9240.6612317518. The cubic root of 85389820 is about 440.3540882507.

The spelling of 85389820 in words is "eighty-five million, three hundred eighty-nine thousand, eight hundred twenty".