987878 has 4 divisors (see below), whose sum is σ = 1481820. Its totient is φ = 493938.

The previous prime is 987869. The next prime is 987911. The reversal of 987878 is 878789.

987878 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

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

It is a congruent number.

It is an unprimeable number.

987878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246968 + ... + 246971.

It is an arithmetic number, because the mean of its divisors is an integer number (370455).

2⁹⁸⁷⁸⁷⁸ is an apocalyptic number.

987878 is a deficient number, since it is larger than the sum of its proper divisors (493942).

987878 is a wasteful number, since it uses less digits than its factorization.

987878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493941.

The product of its digits is 225792, while the sum is 47.

The square root of 987878 is about 993.9205199612. The cubic root of 987878 is about 99.5942895496.

It can be divided in two parts, 987 and 878, that multiplied together give a triangular number (866586 = T₁₃₁₆).

The spelling of 987878 in words is "nine hundred eighty-seven thousand, eight hundred seventy-eight".