78872111 has 4 divisors (see below), whose sum is σ = 79163424. Its totient is φ = 78580800.

The previous prime is 78872077. The next prime is 78872117. The reversal of 78872111 is 11127887.

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 78872111 - 2²² = 74677807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78872117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145250 + ... + 145791.

It is an arithmetic number, because the mean of its divisors is an integer number (19790856).

Almost surely, 2^78872111 is an apocalyptic number.

78872111 is a deficient number, since it is larger than the sum of its proper divisors (291313).

78872111 is a wasteful number, since it uses less digits than its factorization.

78872111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291312.

The product of its digits is 6272, while the sum is 35.

The square root of 78872111 is about 8880.9971850012. The cubic root of 78872111 is about 428.8523770178.

Adding to 78872111 its reverse (11127887), we get a palindrome (89999998).

The spelling of 78872111 in words is "seventy-eight million, eight hundred seventy-two thousand, one hundred eleven".