172809616 has 40 divisors (see below), whose sum is σ = 388377920. Its totient is φ = 72952704.

The previous prime is 172809599. The next prime is 172809619. The reversal of 172809616 is 616908271.

It is not an unprimeable number, because it can be changed into a prime (172809619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4011 + ... + 19018.

It is an arithmetic number, because the mean of its divisors is an integer number (9709448).

Almost surely, 2^172809616 is an apocalyptic number.

172809616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172809616 is an abundant number, since it is smaller than the sum of its proper divisors (215568304).

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

172809616 is a wasteful number, since it uses less digits than its factorization.

172809616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23111 (or 23105 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 172809616 is about 13145.7071319880. The cubic root of 172809616 is about 557.0009916748. Note that the first 3 decimals are identical.

It can be divided in two parts, 17280 and 9616, that added together give a square (26896 = 164²).

The spelling of 172809616 in words is "one hundred seventy-two million, eight hundred nine thousand, six hundred sixteen".