11978108478 has 48 divisors (see below), whose sum is σ = 31221141120. Its totient is φ = 3242194128.

The previous prime is 11978108419. The next prime is 11978108479. The reversal of 11978108478 is 87480187911.

11978108478 is a `hidden beast` number, since 1 + 1 + 97 + 81 + 0 + 8 + 478 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978108479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2499300 + ... + 2504087.

It is an arithmetic number, because the mean of its divisors is an integer number (650440440).

Almost surely, 2^11978108478 is an apocalyptic number.

11978108478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11978108478 is an abundant number, since it is smaller than the sum of its proper divisors (19243032642).

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

11978108478 is a wasteful number, since it uses less digits than its factorization.

11978108478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5003421 (or 5003418 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 54.

The spelling of 11978108478 in words is "eleven billion, nine hundred seventy-eight million, one hundred eight thousand, four hundred seventy-eight".