71878969 has 2 divisors, whose sum is σ = 71878970. Its totient is φ = 71878968.

The previous prime is 71878943. The next prime is 71879047. The reversal of 71878969 is 96987817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 33500944 = 6195^2 + 5788^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71878969 is a prime.

It is a super-2 number, since 2×71878969² = 10333172369005922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71878769) 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, 35939484 + 35939485.

It is an arithmetic number, because the mean of its divisors is an integer number (35939485).

Almost surely, 2^71878969 is an apocalyptic number.

It is an amenable number.

71878969 is a deficient number, since it is larger than the sum of its proper divisors (1).

71878969 is an equidigital number, since it uses as much as digits as its factorization.

71878969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The square root of 71878969 is about 8478.1465545248. The cubic root of 71878969 is about 415.7835277378.

The spelling of 71878969 in words is "seventy-one million, eight hundred seventy-eight thousand, nine hundred sixty-nine".