71047728 has 60 divisors (see below), whose sum is σ = 199426968. Its totient is φ = 23612160.

The previous prime is 71047727. The next prime is 71047771. The reversal of 71047728 is 82774017.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 71047692 and 71047701.

It is not an unprimeable number, because it can be changed into a prime (71047723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74551 + ... + 75497.

Almost surely, 2^71047728 is an apocalyptic number.

It is an amenable number.

71047728 is an abundant number, since it is smaller than the sum of its proper divisors (128379240).

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

71047728 is a wasteful number, since it uses less digits than its factorization.

71047728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1473 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 71047728 is about 8428.9814331270. The cubic root of 71047728 is about 414.1745395815.

The spelling of 71047728 in words is "seventy-one million, forty-seven thousand, seven hundred twenty-eight".