71530642 has 4 divisors (see below), whose sum is σ = 107295966. Its totient is φ = 35765320.

The previous prime is 71530637. The next prime is 71530673. The reversal of 71530642 is 24603517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24603517 = 281 ⋅87557.

It can be written as a sum of positive squares in only one way, i.e., 48288601 + 23242041 = 6949^2 + 4821^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71530642.

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 as a sum of consecutive naturals, namely, 17882659 + ... + 17882662.

Almost surely, 2^71530642 is an apocalyptic number.

71530642 is a deficient number, since it is larger than the sum of its proper divisors (35765324).

71530642 is a wasteful number, since it uses less digits than its factorization.

71530642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35765323.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 71530642 is about 8457.5789680026. The cubic root of 71530642 is about 415.1108079780.

The spelling of 71530642 in words is "seventy-one million, five hundred thirty thousand, six hundred forty-two".