3978656023608 has 384 divisors, whose sum is σ = 13528806520320. Its totient is φ = 1069370449920.

The previous prime is 3978656023603. The next prime is 3978656023619. The reversal of 3978656023608 is 8063206568793.

3978656023608 is a `hidden beast` number, since 3 + 9 + 7 + 8 + 6 + 560 + 2 + 3 + 60 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978656023603) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 842754688 + ... + 842759408.

It is an arithmetic number, because the mean of its divisors is an integer number (35231266980).

Almost surely, 2^{3978656023608} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3978656023608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6764403260160).

3978656023608 is an abundant number, since it is smaller than the sum of its proper divisors (9550150496712).

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

3978656023608 is a wasteful number, since it uses less digits than its factorization.

3978656023608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409 (or 8393 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 63.

The spelling of 3978656023608 in words is "three trillion, nine hundred seventy-eight billion, six hundred fifty-six million, twenty-three thousand, six hundred eight".