194778328140 has 144 divisors (see below), whose sum is σ = 644828760576. Its totient is φ = 47197776000.

The previous prime is 194778328139. The next prime is 194778328141. The reversal of 194778328140 is 41823877491.

194778328140 is a `hidden beast` number, since 1 + 9 + 477 + 8 + 3 + 28 + 140 = 666.

194778328140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (194778328139) and next prime (194778328141).

It is a super-2 number, since 2×194778328140² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (194778328141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4634059 + ... + 4675901.

It is an arithmetic number, because the mean of its divisors is an integer number (4477977504).

Almost surely, 2^194778328140 is an apocalyptic number.

194778328140 is a gapful number since it is divisible by the number (10) 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 194778328140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322414380288).

194778328140 is an abundant number, since it is smaller than the sum of its proper divisors (450050432436).

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

194778328140 is a wasteful number, since it uses less digits than its factorization.

194778328140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44220 (or 44215 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 194778328140 in words is "one hundred ninety-four billion, seven hundred seventy-eight million, three hundred twenty-eight thousand, one hundred forty".