71528242 has 4 divisors (see below), whose sum is σ = 107292366. Its totient is φ = 35764120.

The previous prime is 71528203. The next prime is 71528251. The reversal of 71528242 is 24282517.

It is a happy number.

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., 36493681 + 35034561 = 6041^2 + 5919^2 .

It is a super-2 number, since 2×71528242² = 10232578807221128, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 17882059 + ... + 17882062.

Almost surely, 2^71528242 is an apocalyptic number.

71528242 is a deficient number, since it is larger than the sum of its proper divisors (35764124).

71528242 is a wasteful number, since it uses less digits than its factorization.

71528242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35764123.

The product of its digits is 8960, while the sum is 31.

The square root of 71528242 is about 8457.4370822371. The cubic root of 71528242 is about 415.1061653192.

The spelling of 71528242 in words is "seventy-one million, five hundred twenty-eight thousand, two hundred forty-two".