387663878789 has 12 divisors (see below), whose sum is σ = 431947014828. Its totient is φ = 347594005440.

The previous prime is 387663878729. The next prime is 387663878827. The reversal of 387663878789 is 987878366783.

It can be written as a sum of positive squares in 2 ways, for example, as 332198918689 + 55464960100 = 576367^2 + 235510^2 .

It is not a de Polignac number, because 387663878789 - 2⁸ = 387663878533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387663878729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21935234 + ... + 21952899.

It is an arithmetic number, because the mean of its divisors is an integer number (35995584569).

Almost surely, 2^387663878789 is an apocalyptic number.

It is an amenable number.

387663878789 is a deficient number, since it is larger than the sum of its proper divisors (44283136039).

387663878789 is a wasteful number, since it uses less digits than its factorization.

387663878789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43888228 (or 43888217 counting only the distinct ones).

The product of its digits is 4096770048, while the sum is 80.

The spelling of 387663878789 in words is "three hundred eighty-seven billion, six hundred sixty-three million, eight hundred seventy-eight thousand, seven hundred eighty-nine".