71617387 has 4 divisors (see below), whose sum is σ = 72132760. Its totient is φ = 71102016.

The previous prime is 71617361. The next prime is 71617411. The reversal of 71617387 is 78371617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78371617 = 937 ⋅83641.

It is a cyclic number.

It is not a de Polignac number, because 71617387 - 2²³ = 63228779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71617087) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 257478 + ... + 257755.

It is an arithmetic number, because the mean of its divisors is an integer number (18033190).

Almost surely, 2^71617387 is an apocalyptic number.

71617387 is a deficient number, since it is larger than the sum of its proper divisors (515373).

71617387 is a wasteful number, since it uses less digits than its factorization.

71617387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515372.

The product of its digits is 49392, while the sum is 40.

The square root of 71617387 is about 8462.7056548128. The cubic root of 71617387 is about 415.2785414132.

The spelling of 71617387 in words is "seventy-one million, six hundred seventeen thousand, three hundred eighty-seven".