1928717172 has 36 divisors (see below), whose sum is σ = 4876851616. Its totient is φ = 642710160.

The previous prime is 1928717171. The next prime is 1928717183. The reversal of 1928717172 is 2717178291.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1928717171) 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 11 ways as a sum of consecutive naturals, for example, 158547 + ... + 170277.

Almost surely, 2^1928717172 is an apocalyptic number.

1928717172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1928717172 is an abundant number, since it is smaller than the sum of its proper divisors (2948134444).

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

1928717172 is a wasteful number, since it uses less digits than its factorization.

1928717172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16308 (or 16303 counting only the distinct ones).

The product of its digits is 98784, while the sum is 45.

The square root of 1928717172 is about 43917.1626132654. The cubic root of 1928717172 is about 1244.7711545317.

The spelling of 1928717172 in words is "one billion, nine hundred twenty-eight million, seven hundred seventeen thousand, one hundred seventy-two".