71662643 has 8 divisors (see below), whose sum is σ = 78263136. Its totient is φ = 65217600.

The previous prime is 71662621. The next prime is 71662681. The reversal of 71662643 is 34626617.

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 71662643 - 2⁶ = 71662579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71662343) 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 7 ways as a sum of consecutive naturals, for example, 37898 + ... + 39743.

It is an arithmetic number, because the mean of its divisors is an integer number (9782892).

Almost surely, 2^71662643 is an apocalyptic number.

71662643 is a deficient number, since it is larger than the sum of its proper divisors (6600493).

71662643 is a wasteful number, since it uses less digits than its factorization.

71662643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77725.

The product of its digits is 36288, while the sum is 35.

The square root of 71662643 is about 8465.3790818840. The cubic root of 71662643 is about 415.3659963789.

The spelling of 71662643 in words is "seventy-one million, six hundred sixty-two thousand, six hundred forty-three".