71809010 has 48 divisors (see below), whose sum is σ = 161939736. Its totient is φ = 22724352.

The previous prime is 71808983. The next prime is 71809021. The reversal of 71809010 is 1090817.

It can be written as a sum of positive squares in 4 ways, for example, as 35652841 + 36156169 = 5971^2 + 6013^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 734 + ... + 12006.

Almost surely, 2^71809010 is an apocalyptic number.

71809010 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71809010 is an abundant number, since it is smaller than the sum of its proper divisors (90130726).

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

71809010 is a wasteful number, since it uses less digits than its factorization.

71809010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11307 (or 11300 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 71809010 is about 8474.0197073172. The cubic root of 71809010 is about 415.6485914587.

Adding to 71809010 its reverse (1090817), we get a palindrome (72899827).

The spelling of 71809010 in words is "seventy-one million, eight hundred nine thousand, ten".