71689477 has 2 divisors, whose sum is σ = 71689478. Its totient is φ = 71689476.

The previous prime is 71689469. The next prime is 71689483. The reversal of 71689477 is 77498617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42432196 + 29257281 = 6514^2 + 5409^2 .

It is a cyclic number.

It is not a de Polignac number, because 71689477 - 2³ = 71689469 is a prime.

It is a super-2 number, since 2×71689477² = 10278762225067058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71689477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71689417) 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 as a sum of consecutive naturals, namely, 35844738 + 35844739.

It is an arithmetic number, because the mean of its divisors is an integer number (35844739).

Almost surely, 2^71689477 is an apocalyptic number.

It is an amenable number.

71689477 is a deficient number, since it is larger than the sum of its proper divisors (1).

71689477 is an equidigital number, since it uses as much as digits as its factorization.

71689477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 49.

The square root of 71689477 is about 8466.9638596134. The cubic root of 71689477 is about 415.4178343602.

The spelling of 71689477 in words is "seventy-one million, six hundred eighty-nine thousand, four hundred seventy-seven".