71284789 has 4 divisors (see below), whose sum is σ = 75036640. Its totient is φ = 67532940.

The previous prime is 71284777. The next prime is 71284793. The reversal of 71284789 is 98748217.

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: 98748217 = 6311 ⋅15647.

It is a cyclic number.

It is not a de Polignac number, because 71284789 - 2⁹ = 71284277 is a prime.

It is a super-2 number, since 2×71284789² = 10163042285549042, 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 (71284709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1875897 + ... + 1875934.

It is an arithmetic number, because the mean of its divisors is an integer number (18759160).

Almost surely, 2^71284789 is an apocalyptic number.

It is an amenable number.

71284789 is a deficient number, since it is larger than the sum of its proper divisors (3751851).

71284789 is a wasteful number, since it uses less digits than its factorization.

71284789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3751850.

The product of its digits is 225792, while the sum is 46.

The square root of 71284789 is about 8443.0319790938. The cubic root of 71284789 is about 414.6346792316.

The spelling of 71284789 in words is "seventy-one million, two hundred eighty-four thousand, seven hundred eighty-nine".