172108683738 has 32 divisors (see below), whose sum is σ = 383472926400. Its totient is φ = 57218183568.

The previous prime is 172108683731. The next prime is 172108683749. The reversal of 172108683738 is 837386801271.

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 (172108683731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4184281 + ... + 4225212.

It is an arithmetic number, because the mean of its divisors is an integer number (11983528950).

Almost surely, 2^172108683738 is an apocalyptic number.

172108683738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172108683738 is an abundant number, since it is smaller than the sum of its proper divisors (211364242662).

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

172108683738 is a wasteful number, since it uses less digits than its factorization.

172108683738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8409883 (or 8409877 counting only the distinct ones).

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

The spelling of 172108683738 in words is "one hundred seventy-two billion, one hundred eight million, six hundred eighty-three thousand, seven hundred thirty-eight".