387728008639 has 4 divisors (see below), whose sum is σ = 387730999600. Its totient is φ = 387725017680.

The previous prime is 387728008637. The next prime is 387728008663. The reversal of 387728008639 is 936800827783.

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

It is a cyclic number.

It is not a de Polignac number, because 387728008639 - 2¹ = 387728008637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387728008637) by changing a digit.

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, 1291782 + ... + 1563379.

It is an arithmetic number, because the mean of its divisors is an integer number (96932749900).

Almost surely, 2^387728008639 is an apocalyptic number.

387728008639 is a deficient number, since it is larger than the sum of its proper divisors (2990961).

387728008639 is a wasteful number, since it uses less digits than its factorization.

387728008639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2990960.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 387728008639 in words is "three hundred eighty-seven billion, seven hundred twenty-eight million, eight thousand, six hundred thirty-nine".