71505228 has 24 divisors (see below), whose sum is σ = 166985280. Its totient is φ = 23815120.

The previous prime is 71505223. The next prime is 71505253. The reversal of 71505228 is 82250517.

It is a super-2 number, since 2×71505228² = 10225995262663968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71505195 and 71505204.

It is not an unprimeable number, because it can be changed into a prime (71505223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22243 + ... + 25253.

It is an arithmetic number, because the mean of its divisors is an integer number (6957720).

Almost surely, 2^71505228 is an apocalyptic number.

It is an amenable number.

71505228 is an abundant number, since it is smaller than the sum of its proper divisors (95480052).

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

71505228 is a wasteful number, since it uses less digits than its factorization.

71505228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4997 (or 4995 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 71505228 is about 8456.0763951138. The cubic root of 71505228 is about 415.0616408173.

The spelling of 71505228 in words is "seventy-one million, five hundred five thousand, two hundred twenty-eight".