71635138 has 8 divisors (see below), whose sum is σ = 107518140. Its totient is φ = 35795760.

The previous prime is 71635129. The next prime is 71635139. The reversal of 71635138 is 83153617.

It can be written as a sum of positive squares in 2 ways, for example, as 71622369 + 12769 = 8463^2 + 113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (71635139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6433 + ... + 13588.

Almost surely, 2^71635138 is an apocalyptic number.

71635138 is a deficient number, since it is larger than the sum of its proper divisors (35883002).

71635138 is a wasteful number, since it uses less digits than its factorization.

71635138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21812.

The product of its digits is 15120, while the sum is 34.

The square root of 71635138 is about 8463.7543678914. The cubic root of 71635138 is about 415.3128487267.

It can be divided in two parts, 71 and 635138, that added together give a square (635209 = 797²).

The spelling of 71635138 in words is "seventy-one million, six hundred thirty-five thousand, one hundred thirty-eight".