78871571 has 4 divisors (see below), whose sum is σ = 78922200. Its totient is φ = 78820944.

The previous prime is 78871567. The next prime is 78871591. The reversal of 78871571 is 17517887.

It is a happy number.

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 78871571 - 2² = 78871567 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (78871591) 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, 22901 + ... + 26118.

It is an arithmetic number, because the mean of its divisors is an integer number (19730550).

Almost surely, 2^78871571 is an apocalyptic number.

78871571 is a deficient number, since it is larger than the sum of its proper divisors (50629).

78871571 is a wasteful number, since it uses less digits than its factorization.

78871571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50628.

The product of its digits is 109760, while the sum is 44.

The square root of 78871571 is about 8880.9667829578. The cubic root of 78871571 is about 428.8513982992.

The spelling of 78871571 in words is "seventy-eight million, eight hundred seventy-one thousand, five hundred seventy-one".