85381620 has 48 divisors (see below), whose sum is σ = 242108160. Its totient is φ = 22478976.

The previous prime is 85381609. The next prime is 85381643. The reversal of 85381620 is 2618358.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4267 + ... + 13746.

It is an arithmetic number, because the mean of its divisors is an integer number (5043920).

Almost surely, 2^85381620 is an apocalyptic number.

It is an amenable number.

85381620 is an abundant number, since it is smaller than the sum of its proper divisors (156726540).

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

85381620 is a wasteful number, since it uses less digits than its factorization.

85381620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18104 (or 18102 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 85381620 is about 9240.2175299070. The cubic root of 85381620 is about 440.3399920383.

Adding to 85381620 its reverse (2618358), we get a palindrome (87999978).

The spelling of 85381620 in words is "eighty-five million, three hundred eighty-one thousand, six hundred twenty".