71685145 has 16 divisors (see below), whose sum is σ = 98887680. Its totient is φ = 48867264.

The previous prime is 71685137. The next prime is 71685151. The reversal of 71685145 is 54158617.

It is a cyclic number.

It is not a de Polignac number, because 71685145 - 2³ = 71685137 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136 + ... + 11974.

It is an arithmetic number, because the mean of its divisors is an integer number (6180480).

Almost surely, 2^71685145 is an apocalyptic number.

It is an amenable number.

71685145 is a deficient number, since it is larger than the sum of its proper divisors (27202535).

71685145 is a wasteful number, since it uses less digits than its factorization.

71685145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12024.

The product of its digits is 33600, while the sum is 37.

The square root of 71685145 is about 8466.7080379567. The cubic root of 71685145 is about 415.4094666685.

The spelling of 71685145 in words is "seventy-one million, six hundred eighty-five thousand, one hundred forty-five".