71982869 has 4 divisors (see below), whose sum is σ = 82266144. Its totient is φ = 61699596.

The previous prime is 71982793. The next prime is 71982931. The reversal of 71982869 is 96828917.

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: 96828917 = 311 ⋅311347.

It is not a de Polignac number, because 71982869 - 2⁸ = 71982613 is a prime.

It is a super-2 number, since 2×71982869² = 10363066858942322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71982269) 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, 5141627 + ... + 5141640.

It is an arithmetic number, because the mean of its divisors is an integer number (20566536).

Almost surely, 2^71982869 is an apocalyptic number.

It is an amenable number.

71982869 is a deficient number, since it is larger than the sum of its proper divisors (10283275).

71982869 is a wasteful number, since it uses less digits than its factorization.

71982869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10283274.

The product of its digits is 435456, while the sum is 50.

The square root of 71982869 is about 8484.2718603307. The cubic root of 71982869 is about 415.9837676266.

The spelling of 71982869 in words is "seventy-one million, nine hundred eighty-two thousand, eight hundred sixty-nine".