71487728 has 40 divisors (see below), whose sum is σ = 157021200. Its totient is φ = 31256064.

The previous prime is 71487707. The next prime is 71487751. The reversal of 71487728 is 82778417.

It is a super-2 number, since 2×71487728² = 10220990509203968, 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, 5093 + ... + 12996.

It is an arithmetic number, because the mean of its divisors is an integer number (3925530).

Almost surely, 2^71487728 is an apocalyptic number.

It is an amenable number.

71487728 is an abundant number, since it is smaller than the sum of its proper divisors (85533472).

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

71487728 is a wasteful number, since it uses less digits than its factorization.

71487728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18129 (or 18123 counting only the distinct ones).

The product of its digits is 175616, while the sum is 44.

The square root of 71487728 is about 8455.0415729315. The cubic root of 71487728 is about 415.0277776926.

The spelling of 71487728 in words is "seventy-one million, four hundred eighty-seven thousand, seven hundred twenty-eight".