71684889 has 4 divisors (see below), whose sum is σ = 95579856. Its totient is φ = 47789924.

The previous prime is 71684881. The next prime is 71684923. The reversal of 71684889 is 98848617.

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.

It is a cyclic number.

It is not a de Polignac number, because 71684889 - 2³ = 71684881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71684881) 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, 11947479 + ... + 11947484.

It is an arithmetic number, because the mean of its divisors is an integer number (23894964).

Almost surely, 2^71684889 is an apocalyptic number.

It is an amenable number.

71684889 is a deficient number, since it is larger than the sum of its proper divisors (23894967).

71684889 is a wasteful number, since it uses less digits than its factorization.

71684889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23894966.

The product of its digits is 774144, while the sum is 51.

The square root of 71684889 is about 8466.6929199068. The cubic root of 71684889 is about 415.4089721684.

The spelling of 71684889 in words is "seventy-one million, six hundred eighty-four thousand, eight hundred eighty-nine".