3978118656 has 100 divisors (see below), whose sum is σ = 11873760492. Its totient is φ = 1326025728.

The previous prime is 3978118619. The next prime is 3978118699. The reversal of 3978118656 is 6568118793.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6490 + ... + 89433.

Almost surely, 2^3978118656 is an apocalyptic number.

3978118656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3978118656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5936880246).

3978118656 is an abundant number, since it is smaller than the sum of its proper divisors (7895641836).

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

3978118656 is an frugal number, since it uses more digits than its factorization.

3978118656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95953 (or 95928 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 3978118656 is about 63072.3287662664. The cubic root of 3978118656 is about 1584.5012187951.

The spelling of 3978118656 in words is "three billion, nine hundred seventy-eight million, one hundred eighteen thousand, six hundred fifty-six".