71281745 has 8 divisors (see below), whose sum is σ = 87527616. Its totient is φ = 55699056.

The previous prime is 71281687. The next prime is 71281783. The reversal of 71281745 is 54718217.

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

It is a cyclic number.

It is not a de Polignac number, because 71281745 - 2¹⁰ = 71280721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165557 + ... + 165986.

It is an arithmetic number, because the mean of its divisors is an integer number (10940952).

Almost surely, 2^71281745 is an apocalyptic number.

It is an amenable number.

71281745 is a deficient number, since it is larger than the sum of its proper divisors (16245871).

71281745 is a wasteful number, since it uses less digits than its factorization.

71281745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331591.

The product of its digits is 15680, while the sum is 35.

The square root of 71281745 is about 8442.8517101747. The cubic root of 71281745 is about 414.6287772435.

The spelling of 71281745 in words is "seventy-one million, two hundred eighty-one thousand, seven hundred forty-five".