71660785 has 12 divisors (see below), whose sum is σ = 100032948. Its totient is φ = 49138656.

The previous prime is 71660783. The next prime is 71660791. The reversal of 71660785 is 58706617.

It can be written as a sum of positive squares in 2 ways, for example, as 24216241 + 47444544 = 4921^2 + 6888^2 .

It is not a de Polignac number, because 71660785 - 2¹ = 71660783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71660783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146002 + ... + 146491.

It is an arithmetic number, because the mean of its divisors is an integer number (8336079).

Almost surely, 2^71660785 is an apocalyptic number.

It is an amenable number.

71660785 is a deficient number, since it is larger than the sum of its proper divisors (28372163).

71660785 is a wasteful number, since it uses less digits than its factorization.

71660785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292512 (or 292505 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 71660785 is about 8465.2693400742. The cubic root of 71660785 is about 415.3624066113.

The spelling of 71660785 in words is "seventy-one million, six hundred sixty thousand, seven hundred eighty-five".