71228864 has 28 divisors (see below), whose sum is σ = 161537904. Its totient is φ = 30526464.

The previous prime is 71228863. The next prime is 71228867. The reversal of 71228864 is 46882217.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71228863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79049 + ... + 79944.

Almost surely, 2^71228864 is an apocalyptic number.

It is an amenable number.

71228864 is an abundant number, since it is smaller than the sum of its proper divisors (90309040).

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

71228864 is a wasteful number, since it uses less digits than its factorization.

71228864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159012 (or 159002 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 71228864 is about 8439.7194266160. The cubic root of 71228864 is about 414.5262198561.

The spelling of 71228864 in words is "seventy-one million, two hundred twenty-eight thousand, eight hundred sixty-four".