172328687 has 2 divisors, whose sum is σ = 172328688. Its totient is φ = 172328686.

The previous prime is 172328641. The next prime is 172328749. The reversal of 172328687 is 786823271.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172328687 - 2¹² = 172324591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172328987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86164343 + 86164344.

It is an arithmetic number, because the mean of its divisors is an integer number (86164344).

Almost surely, 2^172328687 is an apocalyptic number.

172328687 is a deficient number, since it is larger than the sum of its proper divisors (1).

172328687 is an equidigital number, since it uses as much as digits as its factorization.

172328687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 44.

The square root of 172328687 is about 13127.4021420843. The cubic root of 172328687 is about 556.4838005169.

The spelling of 172328687 in words is "one hundred seventy-two million, three hundred twenty-eight thousand, six hundred eighty-seven".