78425311 has 4 divisors (see below), whose sum is σ = 80544952. Its totient is φ = 76305672.

The previous prime is 78425261. The next prime is 78425317. The reversal of 78425311 is 11352487.

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 78425311 - 2⁷ = 78425183 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 (78425317) 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, 1059765 + ... + 1059838.

It is an arithmetic number, because the mean of its divisors is an integer number (20136238).

Almost surely, 2^78425311 is an apocalyptic number.

78425311 is a deficient number, since it is larger than the sum of its proper divisors (2119641).

78425311 is a wasteful number, since it uses less digits than its factorization.

78425311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119640.

The product of its digits is 6720, while the sum is 31.

The square root of 78425311 is about 8855.8066261634. The cubic root of 78425311 is about 428.0410458641.

Adding to 78425311 its reverse (11352487), we get a palindrome (89777798).

The spelling of 78425311 in words is "seventy-eight million, four hundred twenty-five thousand, three hundred eleven".