71688673 has 4 divisors (see below), whose sum is σ = 81929920. Its totient is φ = 61447428.

The previous prime is 71688649. The next prime is 71688731. The reversal of 71688673 is 37688617.

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 not a de Polignac number, because 71688673 - 2⁵ = 71688641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71688073) 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, 5120613 + ... + 5120626.

It is an arithmetic number, because the mean of its divisors is an integer number (20482480).

Almost surely, 2^71688673 is an apocalyptic number.

It is an amenable number.

71688673 is a deficient number, since it is larger than the sum of its proper divisors (10241247).

71688673 is a wasteful number, since it uses less digits than its factorization.

71688673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10241246.

The product of its digits is 338688, while the sum is 46.

The square root of 71688673 is about 8466.9163808319. The cubic root of 71688673 is about 415.4162813792.

It can be divided in two parts, 71688 and 673, that added together give a square (72361 = 269²).

The spelling of 71688673 in words is "seventy-one million, six hundred eighty-eight thousand, six hundred seventy-three".