987665578 has 8 divisors (see below), whose sum is σ = 1481643072. Its totient is φ = 493784556.

The previous prime is 987665573. The next prime is 987665587. The reversal of 987665578 is 875566789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (987665573) 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 3 ways as a sum of consecutive naturals, for example, 12751 + ... + 46237.

It is an arithmetic number, because the mean of its divisors is an integer number (185205384).

Almost surely, 2^987665578 is an apocalyptic number.

987665578 is a deficient number, since it is larger than the sum of its proper divisors (493977494).

987665578 is a wasteful number, since it uses less digits than its factorization.

987665578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48236.

The product of its digits is 25401600, while the sum is 61.

The square root of 987665578 is about 31427.1471501948. The cubic root of 987665578 is about 995.8715049849.

The spelling of 987665578 in words is "nine hundred eighty-seven million, six hundred sixty-five thousand, five hundred seventy-eight".