172688534 has 4 divisors (see below), whose sum is σ = 259032804. Its totient is φ = 86344266.

The previous prime is 172688513. The next prime is 172688561. The reversal of 172688534 is 435886271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 435886271 = 23 ⋅18951577.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43172132 + ... + 43172135.

It is an arithmetic number, because the mean of its divisors is an integer number (64758201).

Almost surely, 2^172688534 is an apocalyptic number.

172688534 is a deficient number, since it is larger than the sum of its proper divisors (86344270).

172688534 is an equidigital number, since it uses as much as digits as its factorization.

172688534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86344269.

The product of its digits is 322560, while the sum is 44.

The square root of 172688534 is about 13141.1009432239. The cubic root of 172688534 is about 556.8708705365.

The spelling of 172688534 in words is "one hundred seventy-two million, six hundred eighty-eight thousand, five hundred thirty-four".