78518889 has 12 divisors (see below), whose sum is σ = 117617136. Its totient is φ = 52345764.

The previous prime is 78518879. The next prime is 78518927. The reversal of 78518889 is 98881587.

It is not a de Polignac number, because 78518889 - 2⁷ = 78518761 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78518809) 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 11 ways as a sum of consecutive naturals, for example, 161319 + ... + 161804.

It is an arithmetic number, because the mean of its divisors is an integer number (9801428).

Almost surely, 2^78518889 is an apocalyptic number.

It is an amenable number.

78518889 is a deficient number, since it is larger than the sum of its proper divisors (39098247).

78518889 is an equidigital number, since it uses as much as digits as its factorization.

78518889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323138 (or 323126 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 54.

The square root of 78518889 is about 8861.0884771567. The cubic root of 78518889 is about 428.2112260588.

The spelling of 78518889 in words is "seventy-eight million, five hundred eighteen thousand, eight hundred eighty-nine".