71680861 has 4 divisors (see below), whose sum is σ = 81920992. Its totient is φ = 61440732.

The previous prime is 71680859. The next prime is 71680879. The reversal of 71680861 is 16808617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71680861 - 2¹ = 71680859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71680861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71680841) 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 3 ways as a sum of consecutive naturals, for example, 5120055 + ... + 5120068.

It is an arithmetic number, because the mean of its divisors is an integer number (20480248).

Almost surely, 2^71680861 is an apocalyptic number.

It is an amenable number.

71680861 is a deficient number, since it is larger than the sum of its proper divisors (10240131).

71680861 is a wasteful number, since it uses less digits than its factorization.

71680861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10240130.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 71680861 is about 8466.4550432870. The cubic root of 71680861 is about 415.4011913622.

The spelling of 71680861 in words is "seventy-one million, six hundred eighty thousand, eight hundred sixty-one".