71228180 has 24 divisors (see below), whose sum is σ = 149772672. Its totient is φ = 28454432.

The previous prime is 71228177. The next prime is 71228191. The reversal of 71228180 is 8182217.

It is a super-2 number, since 2×71228180² = 10146907252224800, 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, 17849 + ... + 21471.

It is an arithmetic number, because the mean of its divisors is an integer number (6240528).

Almost surely, 2^71228180 is an apocalyptic number.

It is an amenable number.

71228180 is an abundant number, since it is smaller than the sum of its proper divisors (78544492).

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

71228180 is a wasteful number, since it uses less digits than its factorization.

71228180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4615 (or 4613 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 71228180 is about 8439.6789038446. The cubic root of 71228180 is about 414.5248929743.

The spelling of 71228180 in words is "seventy-one million, two hundred twenty-eight thousand, one hundred eighty".