78425889 has 8 divisors (see below), whose sum is σ = 108173760. Its totient is φ = 50480976.

The previous prime is 78425873. The next prime is 78425909. The reversal of 78425889 is 98852487.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78425889 - 2⁴ = 78425873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78425189) 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 7 ways as a sum of consecutive naturals, for example, 450637 + ... + 450810.

It is an arithmetic number, because the mean of its divisors is an integer number (13521720).

Almost surely, 2^78425889 is an apocalyptic number.

It is an amenable number.

78425889 is a deficient number, since it is larger than the sum of its proper divisors (29747871).

78425889 is a wasteful number, since it uses less digits than its factorization.

78425889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901479.

The product of its digits is 1290240, while the sum is 51.

The square root of 78425889 is about 8855.8392600589. The cubic root of 78425889 is about 428.0420974256.

It can be divided in two parts, 7842 and 5889, that added together give a palindrome (13731).

The spelling of 78425889 in words is "seventy-eight million, four hundred twenty-five thousand, eight hundred eighty-nine".