71047639 has 8 divisors (see below), whose sum is σ = 76763232. Its totient is φ = 65367840.

The previous prime is 71047637. The next prime is 71047643. The reversal of 71047639 is 93674017.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71047639 - 2¹ = 71047637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71047598 and 71047607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71047633) 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, 4744 + ... + 12829.

It is an arithmetic number, because the mean of its divisors is an integer number (9595404).

Almost surely, 2^71047639 is an apocalyptic number.

71047639 is a deficient number, since it is larger than the sum of its proper divisors (5715593).

71047639 is a wasteful number, since it uses less digits than its factorization.

71047639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17897.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 71047639 is about 8428.9761537212. The cubic root of 71047639 is about 414.1743666388.

The spelling of 71047639 in words is "seventy-one million, forty-seven thousand, six hundred thirty-nine".