71680405 has 8 divisors (see below), whose sum is σ = 87846912. Its totient is φ = 56124048.

The previous prime is 71680403. The next prime is 71680409. The reversal of 71680405 is 50408617.

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 71680405 - 2¹ = 71680403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71680403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152277 + ... + 152746.

It is an arithmetic number, because the mean of its divisors is an integer number (10980864).

Almost surely, 2^71680405 is an apocalyptic number.

It is an amenable number.

71680405 is a deficient number, since it is larger than the sum of its proper divisors (16166507).

71680405 is a wasteful number, since it uses less digits than its factorization.

71680405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305075.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 71680405 is about 8466.4281134372. The cubic root of 71680405 is about 415.4003104978.

The spelling of 71680405 in words is "seventy-one million, six hundred eighty thousand, four hundred five".