987878787 has 16 divisors (see below), whose sum is σ = 1506739200. Its totient is φ = 563977152.

The previous prime is 987878779. The next prime is 987878797. The reversal of 987878787 is 787878789.

987878787 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 987878787 - 2³ = 987878779 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (987878737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1839 + ... + 44487.

It is an arithmetic number, because the mean of its divisors is an integer number (94171200).

Almost surely, 2^987878787 is an apocalyptic number.

987878787 is a deficient number, since it is larger than the sum of its proper divisors (518860413).

987878787 is a wasteful number, since it uses less digits than its factorization.

987878787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43762.

The product of its digits is 88510464, while the sum is 69.

The square root of 987878787 is about 31430.5390822366. The cubic root of 987878787 is about 995.9431599714.

The spelling of 987878787 in words is "nine hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred eighty-seven".