78888887 has 16 divisors (see below), whose sum is σ = 98587392. Its totient is φ = 61326720.

The previous prime is 78888871. The next prime is 78888911.

78888887 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78888887 - 2⁴ = 78888871 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 (78888287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41183 + ... + 43055.

It is an arithmetic number, because the mean of its divisors is an integer number (6161712).

Almost surely, 2^78888887 is an apocalyptic number.

78888887 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

78888887 is a deficient number, since it is larger than the sum of its proper divisors (19698505).

78888887 is a wasteful number, since it uses less digits than its factorization.

78888887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438.

The product of its digits is 12845056, while the sum is 62.

The square root of 78888887 is about 8881.9416233164. The cubic root of 78888887 is about 428.8827803182.

The spelling of 78888887 in words is "seventy-eight million, eight hundred eighty-eight thousand, eight hundred eighty-seven".