71878489 has 2 divisors, whose sum is σ = 71878490. Its totient is φ = 71878488.

The previous prime is 71878459. The next prime is 71878517. The reversal of 71878489 is 98487817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41990400 + 29888089 = 6480^2 + 5467^2 .

It is a cyclic number.

It is not a de Polignac number, because 71878489 - 2⁹ = 71877977 is a prime.

It is not a weakly prime, because it can be changed into another prime (71878409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35939244 + 35939245.

It is an arithmetic number, because the mean of its divisors is an integer number (35939245).

Almost surely, 2^71878489 is an apocalyptic number.

It is an amenable number.

71878489 is a deficient number, since it is larger than the sum of its proper divisors (1).

71878489 is an equidigital number, since it uses as much as digits as its factorization.

71878489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 52.

The square root of 71878489 is about 8478.1182464035. The cubic root of 71878489 is about 415.7826022165.

The spelling of 71878489 in words is "seventy-one million, eight hundred seventy-eight thousand, four hundred eighty-nine".