71224138 has 4 divisors (see below), whose sum is σ = 106836210. Its totient is φ = 35612068.

The previous prime is 71224099. The next prime is 71224159. The reversal of 71224138 is 83142217.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45792289 + 25431849 = 6767^2 + 5043^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17806033 + ... + 17806036.

Almost surely, 2^71224138 is an apocalyptic number.

71224138 is a deficient number, since it is larger than the sum of its proper divisors (35612072).

71224138 is a wasteful number, since it uses less digits than its factorization.

71224138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35612071.

The product of its digits is 2688, while the sum is 28.

The square root of 71224138 is about 8439.4394363607. The cubic root of 71224138 is about 414.5170517833.

The spelling of 71224138 in words is "seventy-one million, two hundred twenty-four thousand, one hundred thirty-eight".