71729865 has 48 divisors (see below), whose sum is σ = 129799488. Its totient is φ = 36609408.

The previous prime is 71729843. The next prime is 71729881. The reversal of 71729865 is 56892717.

It is not a de Polignac number, because 71729865 - 2²¹ = 69632713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 71729865.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111234 + ... + 111876.

It is an arithmetic number, because the mean of its divisors is an integer number (2704156).

Almost surely, 2^71729865 is an apocalyptic number.

It is an amenable number.

71729865 is a deficient number, since it is larger than the sum of its proper divisors (58069623).

71729865 is a wasteful number, since it uses less digits than its factorization.

71729865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 755 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 71729865 is about 8469.3485581832. The cubic root of 71729865 is about 415.4958316081.

The spelling of 71729865 in words is "seventy-one million, seven hundred twenty-nine thousand, eight hundred sixty-five".