71685457 has 8 divisors (see below), whose sum is σ = 75545280. Its totient is φ = 67887600.

The previous prime is 71685443. The next prime is 71685487. The reversal of 71685457 is 75458617.

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 71685457 - 2¹⁵ = 71652689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71685407) 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, 13107 + ... + 17752.

It is an arithmetic number, because the mean of its divisors is an integer number (9443160).

Almost surely, 2^71685457 is an apocalyptic number.

It is an amenable number.

71685457 is a deficient number, since it is larger than the sum of its proper divisors (3859823).

71685457 is a wasteful number, since it uses less digits than its factorization.

71685457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30983.

The product of its digits is 235200, while the sum is 43.

The square root of 71685457 is about 8466.7264630434. The cubic root of 71685457 is about 415.4100693390.

The spelling of 71685457 in words is "seventy-one million, six hundred eighty-five thousand, four hundred fifty-seven".