78871081 has 4 divisors (see below), whose sum is σ = 79006032. Its totient is φ = 78736132.

The previous prime is 78871061. The next prime is 78871103. The reversal of 78871081 is 18017887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78871081 - 2¹¹ = 78869033 is a prime.

It is a super-2 number, since 2×78871081² = 12441294836217122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78871031) 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, 66595 + ... + 67768.

It is an arithmetic number, because the mean of its divisors is an integer number (19751508).

Almost surely, 2^78871081 is an apocalyptic number.

It is an amenable number.

78871081 is a deficient number, since it is larger than the sum of its proper divisors (134951).

78871081 is a wasteful number, since it uses less digits than its factorization.

78871081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134950.

The product of its (nonzero) digits is 25088, while the sum is 40.

The square root of 78871081 is about 8880.9391958283. The cubic root of 78871081 is about 428.8505101988.

The spelling of 78871081 in words is "seventy-eight million, eight hundred seventy-one thousand, eighty-one".