387128865 has 16 divisors (see below), whose sum is σ = 620083008. Its totient is φ = 206243136.

The previous prime is 387128839. The next prime is 387128897. The reversal of 387128865 is 568821783.

It is not a de Polignac number, because 387128865 - 2¹³ = 387120673 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579 + ... + 27831.

It is an arithmetic number, because the mean of its divisors is an integer number (38755188).

Almost surely, 2^387128865 is an apocalyptic number.

It is an amenable number.

387128865 is a deficient number, since it is larger than the sum of its proper divisors (232954143).

387128865 is a wasteful number, since it uses less digits than its factorization.

387128865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28208.

The product of its digits is 645120, while the sum is 48.

The square root of 387128865 is about 19675.5905883407. The cubic root of 387128865 is about 728.8170400839.

The spelling of 387128865 in words is "three hundred eighty-seven million, one hundred twenty-eight thousand, eight hundred sixty-five".