172809488 has 60 divisors (see below), whose sum is σ = 370905948. Its totient is φ = 77721600.

The previous prime is 172809479. The next prime is 172809509. The reversal of 172809488 is 884908271.

It can be written as a sum of positive squares in 2 ways, for example, as 48888064 + 123921424 = 6992^2 + 11132^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143288 + ... + 144488.

Almost surely, 2^172809488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172809488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185452974).

172809488 is an abundant number, since it is smaller than the sum of its proper divisors (198096460).

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

172809488 is a wasteful number, since it uses less digits than its factorization.

172809488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1243 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 172809488 is about 13145.7022634776. The cubic root of 172809488 is about 557.0008541513. Note that the first 3 decimals are identical.

The spelling of 172809488 in words is "one hundred seventy-two million, eight hundred nine thousand, four hundred eighty-eight".