71072138 has 8 divisors (see below), whose sum is σ = 112879332. Its totient is φ = 33445696.

The previous prime is 71072117. The next prime is 71072149. The reversal of 71072138 is 83127017.

It can be written as a sum of positive squares in 2 ways, for example, as 70274689 + 797449 = 8383^2 + 893^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 71072138.

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 in 3 ways as a sum of consecutive naturals, for example, 1045145 + ... + 1045212.

Almost surely, 2^71072138 is an apocalyptic number.

71072138 is a deficient number, since it is larger than the sum of its proper divisors (41807194).

71072138 is a wasteful number, since it uses less digits than its factorization.

71072138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090376.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 71072138 is about 8430.4292891881. The cubic root of 71072138 is about 414.2219670558.

The spelling of 71072138 in words is "seventy-one million, seventy-two thousand, one hundred thirty-eight".