85320520 has 32 divisors (see below), whose sum is σ = 197163000. Its totient is φ = 33205248.

The previous prime is 85320511. The next prime is 85320539. The reversal of 85320520 is 2502358.

It can be written as a sum of positive squares in 4 ways, for example, as 83942244 + 1378276 = 9162^2 + 1174^2 .

It is a super-2 number, since 2×85320520² = 14559182266140800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27345 + ... + 30304.

Almost surely, 2^85320520 is an apocalyptic number.

It is an amenable number.

85320520 is an abundant number, since it is smaller than the sum of its proper divisors (111842480).

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

85320520 is a wasteful number, since it uses less digits than its factorization.

85320520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57697 (or 57693 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 85320520 is about 9236.9107389863. The cubic root of 85320520 is about 440.2349296379.

Adding to 85320520 its reverse (2502358), we get a palindrome (87822878).

The spelling of 85320520 in words is "eighty-five million, three hundred twenty thousand, five hundred twenty".