71582987 has 4 divisors (see below), whose sum is σ = 81809136. Its totient is φ = 61356840.

The previous prime is 71582957. The next prime is 71583011. The reversal of 71582987 is 78928517.

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

It is a cyclic number.

It is not a de Polignac number, because 71582987 - 2²² = 67388683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71582947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5113064 + ... + 5113077.

It is an arithmetic number, because the mean of its divisors is an integer number (20452284).

Almost surely, 2^71582987 is an apocalyptic number.

71582987 is a deficient number, since it is larger than the sum of its proper divisors (10226149).

71582987 is a wasteful number, since it uses less digits than its factorization.

71582987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10226148.

The product of its digits is 282240, while the sum is 47.

The square root of 71582987 is about 8460.6729637778. The cubic root of 71582987 is about 415.2120404777.

The spelling of 71582987 in words is "seventy-one million, five hundred eighty-two thousand, nine hundred eighty-seven".