71500180 has 24 divisors (see below), whose sum is σ = 152985672. Its totient is φ = 28060032.

The previous prime is 71500171. The next prime is 71500199. The reversal of 71500180 is 8100517.

It can be written as a sum of positive squares in 4 ways, for example, as 1710864 + 69789316 = 1308^2 + 8354^2 .

It is a super-2 number, since 2×71500180² = 10224551480064800, which contains 22 as substring.

It is a congruent number.

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, 32667 + ... + 34786.

It is an arithmetic number, because the mean of its divisors is an integer number (6374403).

Almost surely, 2^71500180 is an apocalyptic number.

It is an amenable number.

71500180 is an abundant number, since it is smaller than the sum of its proper divisors (81485492).

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

71500180 is a wasteful number, since it uses less digits than its factorization.

71500180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67515 (or 67513 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 71500180 is about 8455.7779062603. Note that the first 3 decimals coincide. The cubic root of 71500180 is about 415.0518733242.

Adding to 71500180 its reverse (8100517), we get a palindrome (79600697).

The spelling of 71500180 in words is "seventy-one million, five hundred thousand, one hundred eighty".