71601985 has 24 divisors (see below), whose sum is σ = 107643816. Its totient is φ = 45319680.

The previous prime is 71601979. The next prime is 71601989. The reversal of 71601985 is 58910617.

It can be written as a sum of positive squares in 4 ways, for example, as 1979649 + 69622336 = 1407^2 + 8344^2 .

It is not a de Polignac number, because 71601985 - 2⁵ = 71601953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71601989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8056 + ... + 14425.

It is an arithmetic number, because the mean of its divisors is an integer number (4485159).

Almost surely, 2^71601985 is an apocalyptic number.

It is an amenable number.

71601985 is a deficient number, since it is larger than the sum of its proper divisors (36041831).

71601985 is a wasteful number, since it uses less digits than its factorization.

71601985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22513 (or 22506 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 71601985 is about 8461.7956132254. The cubic root of 71601985 is about 415.2487694126.

The spelling of 71601985 in words is "seventy-one million, six hundred one thousand, nine hundred eighty-five".