71128220 has 24 divisors (see below), whose sum is σ = 150151344. Its totient is φ = 28302336.

The previous prime is 71128219. The next prime is 71128283. The reversal of 71128220 is 2282117.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5354 + ... + 13073.

It is an arithmetic number, because the mean of its divisors is an integer number (6256306).

Almost surely, 2^71128220 is an apocalyptic number.

It is an amenable number.

71128220 is an abundant number, since it is smaller than the sum of its proper divisors (79023124).

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

71128220 is a wasteful number, since it uses less digits than its factorization.

71128220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18629 (or 18627 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 71128220 is about 8433.7547984276. The cubic root of 71128220 is about 414.3308906060.

The spelling of 71128220 in words is "seventy-one million, one hundred twenty-eight thousand, two hundred twenty".