71360721 has 6 divisors (see below), whose sum is σ = 103076610. Its totient is φ = 47573808.

The previous prime is 71360717. The next prime is 71360749. The reversal of 71360721 is 12706317.

It can be written as a sum of positive squares in only one way, i.e., 69956496 + 1404225 = 8364^2 + 1185^2 .

It is not a de Polignac number, because 71360721 - 2² = 71360717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71360021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3964476 + ... + 3964493.

It is an arithmetic number, because the mean of its divisors is an integer number (17179435).

Almost surely, 2^71360721 is an apocalyptic number.

It is an amenable number.

71360721 is a deficient number, since it is larger than the sum of its proper divisors (31715889).

71360721 is a wasteful number, since it uses less digits than its factorization.

71360721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7928975 (or 7928972 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 71360721 is about 8447.5275080937. The cubic root of 71360721 is about 414.7818488623.

The spelling of 71360721 in words is "seventy-one million, three hundred sixty thousand, seven hundred twenty-one".