71584957387 has 4 divisors (see below), whose sum is σ = 71605971936. Its totient is φ = 71563942840.

The previous prime is 71584957337. The next prime is 71584957429. The reversal of 71584957387 is 78375948517.

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 71584957387 - 2¹⁹ = 71584433099 is a prime.

It is a super-2 number, since 2×71584957387² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71584957337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10502164 + ... + 10508977.

It is an arithmetic number, because the mean of its divisors is an integer number (17901492984).

Almost surely, 2^71584957387 is an apocalyptic number.

71584957387 is a deficient number, since it is larger than the sum of its proper divisors (21014549).

71584957387 is a wasteful number, since it uses less digits than its factorization.

71584957387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21014548.

The product of its digits is 59270400, while the sum is 64.

The spelling of 71584957387 in words is "seventy-one billion, five hundred eighty-four million, nine hundred fifty-seven thousand, three hundred eighty-seven".