71890849 has 4 divisors (see below), whose sum is σ = 71990464. Its totient is φ = 71791236.

The previous prime is 71890831. The next prime is 71890853. The reversal of 71890849 is 94809817.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94809817 = 1289 ⋅73553.

It is a cyclic number.

It is not a de Polignac number, because 71890849 - 2⁹ = 71890337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71890799 and 71890808.

It is not an unprimeable number, because it can be changed into a prime (71890349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48717 + ... + 50170.

It is an arithmetic number, because the mean of its divisors is an integer number (17997616).

Almost surely, 2^71890849 is an apocalyptic number.

It is an amenable number.

71890849 is a deficient number, since it is larger than the sum of its proper divisors (99615).

71890849 is an equidigital number, since it uses as much as digits as its factorization.

71890849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99614.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 71890849 is about 8478.8471504091. The cubic root of 71890849 is about 415.8064330756.

The spelling of 71890849 in words is "seventy-one million, eight hundred ninety thousand, eight hundred forty-nine".