85139620 has 12 divisors (see below), whose sum is σ = 178793244. Its totient is φ = 34055840.

The previous prime is 85139617. The next prime is 85139623. The reversal of 85139620 is 2693158.

It is an interprime number because it is at equal distance from previous prime (85139617) and next prime (85139623).

It can be written as a sum of positive squares in 2 ways, for example, as 50353216 + 34786404 = 7096^2 + 5898^2 .

It is not an unprimeable number, because it can be changed into a prime (85139623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2128471 + ... + 2128510.

It is an arithmetic number, because the mean of its divisors is an integer number (14899437).

Almost surely, 2^85139620 is an apocalyptic number.

It is an amenable number.

85139620 is an abundant number, since it is smaller than the sum of its proper divisors (93653624).

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

85139620 is a wasteful number, since it uses less digits than its factorization.

85139620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256990 (or 4256988 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 85139620 is about 9227.1133080720. The cubic root of 85139620 is about 439.9235748805.

The spelling of 85139620 in words is "eighty-five million, one hundred thirty-nine thousand, six hundred twenty".