71928817 has 2 divisors, whose sum is σ = 71928818. Its totient is φ = 71928816.

The previous prime is 71928799. The next prime is 71928827. The reversal of 71928817 is 71882917.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68409441 + 3519376 = 8271^2 + 1876^2 .

It is a cyclic number.

It is not a de Polignac number, because 71928817 - 2¹⁵ = 71896049 is a prime.

It is not a weakly prime, because it can be changed into another prime (71928827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35964408 + 35964409.

It is an arithmetic number, because the mean of its divisors is an integer number (35964409).

Almost surely, 2^71928817 is an apocalyptic number.

It is an amenable number.

71928817 is a deficient number, since it is larger than the sum of its proper divisors (1).

71928817 is an equidigital number, since it uses as much as digits as its factorization.

71928817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 43.

The square root of 71928817 is about 8481.0858384997. The cubic root of 71928817 is about 415.8796206946.

The spelling of 71928817 in words is "seventy-one million, nine hundred twenty-eight thousand, eight hundred seventeen".