71748209 has 8 divisors (see below), whose sum is σ = 79064832. Its totient is φ = 64688400.

The previous prime is 71748197. The next prime is 71748227. The reversal of 71748209 is 90284717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71748209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71748289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63617 + ... + 64734.

It is an arithmetic number, because the mean of its divisors is an integer number (9883104).

Almost surely, 2^71748209 is an apocalyptic number.

It is an amenable number.

71748209 is a deficient number, since it is larger than the sum of its proper divisors (7316623).

71748209 is a wasteful number, since it uses less digits than its factorization.

71748209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128407.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 71748209 is about 8470.4314530017. The cubic root of 71748209 is about 415.5312478460.

The spelling of 71748209 in words is "seventy-one million, seven hundred forty-eight thousand, two hundred nine".