71809052 has 12 divisors (see below), whose sum is σ = 143618160. Its totient is φ = 30775296.

The previous prime is 71809043. The next prime is 71809069. The reversal of 71809052 is 25090817.

71809052 is an admirable number.

It is a super-3 number, since 3×71809052³ (a number of 25 digits) contains 333 as substring.

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, 1282277 + ... + 1282332.

It is an arithmetic number, because the mean of its divisors is an integer number (11968180).

Almost surely, 2^71809052 is an apocalyptic number.

It is an amenable number.

71809052 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

71809052 is a wasteful number, since it uses less digits than its factorization.

71809052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564620 (or 2564618 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 71809052 is about 8474.0221854796. The cubic root of 71809052 is about 415.6486724942.

Adding to 71809052 its reverse (25090817), we get a palindrome (96899869).

The spelling of 71809052 in words is "seventy-one million, eight hundred nine thousand, fifty-two".