71547842 has 4 divisors (see below), whose sum is σ = 107321766. Its totient is φ = 35773920.

The previous prime is 71547821. The next prime is 71547857. The reversal of 71547842 is 24874517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24874517 = 4457 ⋅5581.

It can be written as a sum of positive squares in only one way, i.e., 54893281 + 16654561 = 7409^2 + 4081^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71547796 and 71547805.

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, 17886959 + ... + 17886962.

Almost surely, 2^71547842 is an apocalyptic number.

71547842 is a deficient number, since it is larger than the sum of its proper divisors (35773924).

71547842 is a wasteful number, since it uses less digits than its factorization.

71547842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35773923.

The product of its digits is 62720, while the sum is 38.

The square root of 71547842 is about 8458.5957463399. The cubic root of 71547842 is about 415.1440773271.

The spelling of 71547842 in words is "seventy-one million, five hundred forty-seven thousand, eight hundred forty-two".