987388625785 has 4 divisors (see below), whose sum is σ = 1184866350948. Its totient is φ = 789910900624.

The previous prime is 987388625731. The next prime is 987388625791. The reversal of 987388625785 is 587526883789.

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

It can be written as a sum of positive squares in 2 ways, for example, as 125809252416 + 861579373369 = 354696^2 + 928213^2 .

It is a cyclic number.

It is not a de Polignac number, because 987388625785 - 2¹⁷ = 987388494713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98738862574 + ... + 98738862583.

It is an arithmetic number, because the mean of its divisors is an integer number (296216587737).

Almost surely, 2^987388625785 is an apocalyptic number.

It is an amenable number.

987388625785 is a deficient number, since it is larger than the sum of its proper divisors (197477725163).

987388625785 is a wasteful number, since it uses less digits than its factorization.

987388625785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197477725162.

The product of its digits is 1625702400, while the sum is 76.

The spelling of 987388625785 in words is "nine hundred eighty-seven billion, three hundred eighty-eight million, six hundred twenty-five thousand, seven hundred eighty-five".