71725257 has 10 divisors (see below), whose sum is σ = 107145258. Its totient is φ = 47816784.

The previous prime is 71725253. The next prime is 71725267. The reversal of 71725257 is 75252717.

It can be written as a sum of positive squares in only one way, i.e., 71723961 + 1296 = 8469^2 + 36^2 .

It is not a de Polignac number, because 71725257 - 2² = 71725253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71725253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 442668 + ... + 442829.

Almost surely, 2^71725257 is an apocalyptic number.

It is an amenable number.

71725257 is a deficient number, since it is larger than the sum of its proper divisors (35420001).

71725257 is an equidigital number, since it uses as much as digits as its factorization.

71725257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885509 (or 885500 counting only the distinct ones).

The product of its digits is 34300, while the sum is 36.

The square root of 71725257 is about 8469.0765140008. The cubic root of 71725257 is about 415.4869341250.

The spelling of 71725257 in words is "seventy-one million, seven hundred twenty-five thousand, two hundred fifty-seven".