71242128 has 30 divisors (see below), whose sum is σ = 199379414. Its totient is φ = 23747328.

The previous prime is 71242117. The next prime is 71242163. The reversal of 71242128 is 82124217.

It can be written as a sum of positive squares in only one way, i.e., 66781584 + 4460544 = 8172^2 + 2112^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 247225 + ... + 247512.

Almost surely, 2^71242128 is an apocalyptic number.

It is an amenable number.

71242128 is an abundant number, since it is smaller than the sum of its proper divisors (128137286).

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

71242128 is a wasteful number, since it uses less digits than its factorization.

71242128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494751 (or 494742 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 71242128 is about 8440.5051981502. The cubic root of 71242128 is about 414.5519488196.

The spelling of 71242128 in words is "seventy-one million, two hundred forty-two thousand, one hundred twenty-eight".