194439628172928 has 64 divisors (see below), whose sum is σ = 516768961903200. Its totient is φ = 64776980425728.

The previous prime is 194439628172903. The next prime is 194439628172983. The reversal of 194439628172928 is 829271826934491.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×194439628172928² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 194439628172928.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140831526 + ... + 142205477.

Almost surely, 2^{194439628172928} is an apocalyptic number.

It is an amenable number.

194439628172928 is an abundant number, since it is smaller than the sum of its proper divisors (322329333730272).

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

194439628172928 is a wasteful number, since it uses less digits than its factorization.

194439628172928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283038809 (or 283038797 counting only the distinct ones).

The product of its digits is 752467968, while the sum is 75.

The spelling of 194439628172928 in words is "one hundred ninety-four trillion, four hundred thirty-nine billion, six hundred twenty-eight million, one hundred seventy-two thousand, nine hundred twenty-eight".