172320487 has 4 divisors (see below), whose sum is σ = 172452256. Its totient is φ = 172188720.

The previous prime is 172320461. The next prime is 172320497. The reversal of 172320487 is 784023271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172320487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172320497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63903 + ... + 66544.

It is an arithmetic number, because the mean of its divisors is an integer number (43113064).

Almost surely, 2^172320487 is an apocalyptic number.

172320487 is a deficient number, since it is larger than the sum of its proper divisors (131769).

172320487 is a wasteful number, since it uses less digits than its factorization.

172320487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131768.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 172320487 is about 13127.0898145781. The cubic root of 172320487 is about 556.4749738968.

The spelling of 172320487 in words is "one hundred seventy-two million, three hundred twenty thousand, four hundred eighty-seven".