71684989 has 4 divisors (see below), whose sum is σ = 73997440. Its totient is φ = 69372540.

The previous prime is 71684983. The next prime is 71684993. The reversal of 71684989 is 98948617.

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.

It is a cyclic number.

It is not a de Polignac number, because 71684989 - 2³ = 71684981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71684981) 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, 1156179 + ... + 1156240.

It is an arithmetic number, because the mean of its divisors is an integer number (18499360).

Almost surely, 2^71684989 is an apocalyptic number.

It is an amenable number.

71684989 is a deficient number, since it is larger than the sum of its proper divisors (2312451).

71684989 is a wasteful number, since it uses less digits than its factorization.

71684989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312450.

The product of its digits is 870912, while the sum is 52.

The square root of 71684989 is about 8466.6988253982. The cubic root of 71684989 is about 415.4091653326.

The spelling of 71684989 in words is "seventy-one million, six hundred eighty-four thousand, nine hundred eighty-nine".