71989633 has 2 divisors, whose sum is σ = 71989634. Its totient is φ = 71989632.

The previous prime is 71989601. The next prime is 71989649. The reversal of 71989633 is 33698917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60652944 + 11336689 = 7788^2 + 3367^2 .

It is a cyclic number.

It is not a de Polignac number, because 71989633 - 2⁵ = 71989601 is a prime.

It is not a weakly prime, because it can be changed into another prime (71989693) 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, 35994816 + 35994817.

It is an arithmetic number, because the mean of its divisors is an integer number (35994817).

Almost surely, 2^71989633 is an apocalyptic number.

It is an amenable number.

71989633 is a deficient number, since it is larger than the sum of its proper divisors (1).

71989633 is an equidigital number, since it uses as much as digits as its factorization.

71989633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 71989633 is about 8484.6704709140. The cubic root of 71989633 is about 415.9967967733.

The spelling of 71989633 in words is "seventy-one million, nine hundred eighty-nine thousand, six hundred thirty-three".