987678789 has 4 divisors (see below), whose sum is σ = 1316905056. Its totient is φ = 658452524.

The previous prime is 987678737. The next prime is 987678793. The reversal of 987678789 is 987876789.

987678789 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 987678789 - 2⁷ = 987678661 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987678709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164613129 + ... + 164613134.

It is an arithmetic number, because the mean of its divisors is an integer number (329226264).

Almost surely, 2^987678789 is an apocalyptic number.

It is an amenable number.

987678789 is a deficient number, since it is larger than the sum of its proper divisors (329226267).

987678789 is a wasteful number, since it uses less digits than its factorization.

987678789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329226266.

The product of its digits is 85349376, while the sum is 69.

The square root of 987678789 is about 31427.3573340171. The cubic root of 987678789 is about 995.8759452192.

The spelling of 987678789 in words is "nine hundred eighty-seven million, six hundred seventy-eight thousand, seven hundred eighty-nine".