71145138 has 8 divisors (see below), whose sum is σ = 142290288. Its totient is φ = 23715044.

The previous prime is 71145121. The next prime is 71145163. The reversal of 71145138 is 83154117.

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

71145138 is an admirable number.

It is a super-2 number, since 2×71145138² = 10123261322078088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5928756 + ... + 5928767.

It is an arithmetic number, because the mean of its divisors is an integer number (17786286).

Almost surely, 2^71145138 is an apocalyptic number.

71145138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71145138 is a wasteful number, since it uses less digits than its factorization.

71145138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11857528.

The product of its digits is 3360, while the sum is 30.

The square root of 71145138 is about 8434.7577321462. The cubic root of 71145138 is about 414.3637378329.

The spelling of 71145138 in words is "seventy-one million, one hundred forty-five thousand, one hundred thirty-eight".