71638366 has 4 divisors (see below), whose sum is σ = 107457552. Its totient is φ = 35819182.

The previous prime is 71638349. The next prime is 71638393. The reversal of 71638366 is 66383617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66383617 = 31 ⋅2141407.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 17909590 + ... + 17909593.

It is an arithmetic number, because the mean of its divisors is an integer number (26864388).

Almost surely, 2^71638366 is an apocalyptic number.

71638366 is a deficient number, since it is larger than the sum of its proper divisors (35819186).

71638366 is a wasteful number, since it uses less digits than its factorization.

71638366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35819185.

The product of its digits is 108864, while the sum is 40.

The square root of 71638366 is about 8463.9450612584. The cubic root of 71638366 is about 415.3190868652.

The spelling of 71638366 in words is "seventy-one million, six hundred thirty-eight thousand, three hundred sixty-six".