71328977 has 2 divisors, whose sum is σ = 71328978. Its totient is φ = 71328976.

The previous prime is 71328953. The next prime is 71328979. The reversal of 71328977 is 77982317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63936016 + 7392961 = 7996^2 + 2719^2 .

It is a cyclic number.

It is not a de Polignac number, because 71328977 - 2¹² = 71324881 is a prime.

Together with 71328979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71328979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35664488 + 35664489.

It is an arithmetic number, because the mean of its divisors is an integer number (35664489).

Almost surely, 2^71328977 is an apocalyptic number.

It is an amenable number.

71328977 is a deficient number, since it is larger than the sum of its proper divisors (1).

71328977 is an equidigital number, since it uses as much as digits as its factorization.

71328977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 44.

The square root of 71328977 is about 8445.6484061320. The cubic root of 71328977 is about 414.7203360876.

The spelling of 71328977 in words is "seventy-one million, three hundred twenty-eight thousand, nine hundred seventy-seven".