172487989989 has 36 divisors (see below), whose sum is σ = 289860749100. Its totient is φ = 98553006720.

The previous prime is 172487989963. The next prime is 172487990009. The reversal of 172487989989 is 989989784271.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 93656197089 + 78831792900 = 306033^2 + 280770^2 .

It is not a de Polignac number, because 172487989989 - 2⁹ = 172487989477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172487989889) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4975287 + ... + 5009835.

It is an arithmetic number, because the mean of its divisors is an integer number (8051687475).

Almost surely, 2^172487989989 is an apocalyptic number.

It is an amenable number.

172487989989 is a deficient number, since it is larger than the sum of its proper divisors (117372759111).

172487989989 is a wasteful number, since it uses less digits than its factorization.

172487989989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45890 (or 45880 counting only the distinct ones).

The product of its digits is 1316818944, while the sum is 81.

The spelling of 172487989989 in words is "one hundred seventy-two billion, four hundred eighty-seven million, nine hundred eighty-nine thousand, nine hundred eighty-nine".