3947868078 has 128 divisors (see below), whose sum is σ = 10783134720. Its totient is φ = 931768320.

The previous prime is 3947868053. The next prime is 3947868079. The reversal of 3947868078 is 8708687493.

It is a super-2 number, since 2×3947868078² = 31171324722582828168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947868079) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 219100 + ... + 236432.

It is an arithmetic number, because the mean of its divisors is an integer number (84243240).

Almost surely, 2^3947868078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3947868078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5391567360).

3947868078 is an abundant number, since it is smaller than the sum of its proper divisors (6835266642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3947868078 is a wasteful number, since it uses less digits than its factorization.

3947868078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17402.

The product of its (nonzero) digits is 16257024, while the sum is 60.

The square root of 3947868078 is about 62832.0624999689. The cubic root of 3947868078 is about 1580.4746848594.

The spelling of 3947868078 in words is "three billion, nine hundred forty-seven million, eight hundred sixty-eight thousand, seventy-eight".