3868129778 has 4 divisors (see below), whose sum is σ = 5802194670. Its totient is φ = 1934064888.

The previous prime is 3868129777. The next prime is 3868129807. The reversal of 3868129778 is 8779218683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8779218683 = 13931 ⋅630193.

It can be written as a sum of positive squares in only one way, i.e., 3780651169 + 87478609 = 61487^2 + 9353^2 .

It is not an unprimeable number, because it can be changed into a prime (3868129777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 967032443 + ... + 967032446.

Almost surely, 2^3868129778 is an apocalyptic number.

3868129778 is a deficient number, since it is larger than the sum of its proper divisors (1934064892).

3868129778 is a wasteful number, since it uses less digits than its factorization.

3868129778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934064891.

The product of its digits is 8128512, while the sum is 59.

The square root of 3868129778 is about 62194.2905578961. The cubic root of 3868129778 is about 1569.7615197564.

The spelling of 3868129778 in words is "three billion, eight hundred sixty-eight million, one hundred twenty-nine thousand, seven hundred seventy-eight".