71872657 has 2 divisors, whose sum is σ = 71872658. Its totient is φ = 71872656.

The previous prime is 71872637. The next prime is 71872667. The reversal of 71872657 is 75627817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48986001 + 22886656 = 6999^2 + 4784^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71872657 is a prime.

It is not a weakly prime, because it can be changed into another prime (71872637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35936328 + 35936329.

It is an arithmetic number, because the mean of its divisors is an integer number (35936329).

Almost surely, 2^71872657 is an apocalyptic number.

It is an amenable number.

71872657 is a deficient number, since it is larger than the sum of its proper divisors (1).

71872657 is an equidigital number, since it uses as much as digits as its factorization.

71872657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 43.

The square root of 71872657 is about 8477.7742951791. The cubic root of 71872657 is about 415.7713568043.

The spelling of 71872657 in words is "seventy-one million, eight hundred seventy-two thousand, six hundred fifty-seven".