71685090 has 48 divisors (see below), whose sum is σ = 197349048. Its totient is φ = 17991168.

The previous prime is 71685083. The next prime is 71685091. The reversal of 71685090 is 9058617.

It can be written as a sum of positive squares in 4 ways, for example, as 61168041 + 10517049 = 7821^2 + 3243^2 .

It is not an unprimeable number, because it can be changed into a prime (71685091) 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 23 ways as a sum of consecutive naturals, for example, 21897 + ... + 24956.

Almost surely, 2^71685090 is an apocalyptic number.

71685090 is an abundant number, since it is smaller than the sum of its proper divisors (125663958).

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

71685090 is a wasteful number, since it uses less digits than its factorization.

71685090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46883 (or 46880 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 71685090 is about 8466.7047899404. The cubic root of 71685090 is about 415.4093604284.

The spelling of 71685090 in words is "seventy-one million, six hundred eighty-five thousand, ninety".