38387868781 has 4 divisors (see below), whose sum is σ = 38518885692. Its totient is φ = 38256851872.

The previous prime is 38387868773. The next prime is 38387868787. The reversal of 38387868781 is 18786878383.

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 21235775625 + 17152093156 = 145725^2 + 130966^2 .

It is a cyclic number.

It is not a de Polignac number, because 38387868781 - 2³ = 38387868773 is a prime.

It is a super-2 number, since 2×38387868781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38387868787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65508016 + ... + 65508601.

It is an arithmetic number, because the mean of its divisors is an integer number (9629721423).

Almost surely, 2^38387868781 is an apocalyptic number.

It is an amenable number.

38387868781 is a deficient number, since it is larger than the sum of its proper divisors (131016911).

38387868781 is a wasteful number, since it uses less digits than its factorization.

38387868781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131016910.

The product of its digits is 86704128, while the sum is 67.

The spelling of 38387868781 in words is "thirty-eight billion, three hundred eighty-seven million, eight hundred sixty-eight thousand, seven hundred eighty-one".