71605749 has 8 divisors (see below), whose sum is σ = 95515200. Its totient is φ = 47716736.

The previous prime is 71605733. The next prime is 71605771. The reversal of 71605749 is 94750617.

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 71605749 - 2⁴ = 71605733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71605799) 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, 7552 + ... + 14150.

It is an arithmetic number, because the mean of its divisors is an integer number (11939400).

Almost surely, 2^71605749 is an apocalyptic number.

It is an amenable number.

71605749 is a deficient number, since it is larger than the sum of its proper divisors (23909451).

71605749 is a wasteful number, since it uses less digits than its factorization.

71605749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10219.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 71605749 is about 8462.0180217251. The cubic root of 71605749 is about 415.2560456028.

The spelling of 71605749 in words is "seventy-one million, six hundred five thousand, seven hundred forty-nine".