71038721 has 8 divisors (see below), whose sum is σ = 76595904. Its totient is φ = 65494800.

The previous prime is 71038703. The next prime is 71038727. The reversal of 71038721 is 12783017.

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 71038721 - 2²⁶ = 3929857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71038727) 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, 9746 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (9574488).

Almost surely, 2^71038721 is an apocalyptic number.

It is an amenable number.

71038721 is a deficient number, since it is larger than the sum of its proper divisors (5557183).

71038721 is a wasteful number, since it uses less digits than its factorization.

71038721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6631.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 71038721 is about 8428.4471286234. The cubic root of 71038721 is about 414.1570366632.

The spelling of 71038721 in words is "seventy-one million, thirty-eight thousand, seven hundred twenty-one".