13978355328 has 768 divisors, whose sum is σ = 52276224000. Its totient is φ = 3627970560.

The previous prime is 13978355327. The next prime is 13978355329. The reversal of 13978355328 is 82355387931.

13978355328 is a `hidden beast` number, since 1 + 3 + 9 + 7 + 83 + 553 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (13978355327) and next prime (13978355329).

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

It is not an unprimeable number, because it can be changed into a prime (13978355327) 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, 128241738 + ... + 128241846.

It is an arithmetic number, because the mean of its divisors is an integer number (68068000).

Almost surely, 2^13978355328 is an apocalyptic number.

13978355328 is a gapful number since it is divisible by the number (18) 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 13978355328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26138112000).

13978355328 is an abundant number, since it is smaller than the sum of its proper divisors (38297868672).

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

13978355328 is a wasteful number, since it uses less digits than its factorization.

13978355328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 171 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 13978355328 in words is "thirteen billion, nine hundred seventy-eight million, three hundred fifty-five thousand, three hundred twenty-eight".