78899887 has 16 divisors (see below), whose sum is σ = 88833024. Its totient is φ = 69460000.

The previous prime is 78899869. The next prime is 78899903.

78899887 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 78899887 - 2¹¹ = 78897839 is a prime.

It is a super-2 number, since 2×78899887² = 12450384337225538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78899087) 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 15 ways as a sum of consecutive naturals, for example, 51462 + ... + 52972.

It is an arithmetic number, because the mean of its divisors is an integer number (5552064).

Almost surely, 2^78899887 is an apocalyptic number.

78899887 is a deficient number, since it is larger than the sum of its proper divisors (9933137).

78899887 is a wasteful number, since it uses less digits than its factorization.

78899887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670.

The product of its digits is 16257024, while the sum is 64.

The square root of 78899887 is about 8882.5608357050. The cubic root of 78899887 is about 428.9027133807.

The spelling of 78899887 in words is "seventy-eight million, eight hundred ninety-nine thousand, eight hundred eighty-seven".