71372817 has 18 divisors (see below), whose sum is σ = 109318482. Its totient is φ = 44717376.

The previous prime is 71372803. The next prime is 71372827. The reversal of 71372817 is 71827317.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 67174416 + 4198401 = 8196^2 + 2049^2 .

It is not a de Polignac number, because 71372817 - 2⁴ = 71372801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71372827) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 104158 + ... + 104840.

It is an arithmetic number, because the mean of its divisors is an integer number (6073249).

Almost surely, 2^71372817 is an apocalyptic number.

It is an amenable number.

71372817 is a deficient number, since it is larger than the sum of its proper divisors (37945665).

71372817 is an equidigital number, since it uses as much as digits as its factorization.

71372817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389 (or 703 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 71372817 is about 8448.2434268906. The cubic root of 71372817 is about 414.8052834059.

The spelling of 71372817 in words is "seventy-one million, three hundred seventy-two thousand, eight hundred seventeen".