172256646 has 16 divisors (see below), whose sum is σ = 355627008. Its totient is φ = 55566600.

The previous prime is 172256639. The next prime is 172256647. The reversal of 172256646 is 646652271.

It is a super-3 number, since 3×172256646³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172256647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462870 + ... + 463241.

It is an arithmetic number, because the mean of its divisors is an integer number (22226688).

Almost surely, 2^172256646 is an apocalyptic number.

172256646 is an abundant number, since it is smaller than the sum of its proper divisors (183370362).

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

172256646 is a wasteful number, since it uses less digits than its factorization.

172256646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926147.

The product of its digits is 120960, while the sum is 39.

The square root of 172256646 is about 13124.6579383998. The cubic root of 172256646 is about 556.4062447756.

It can be divided in two parts, 17225 and 6646, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 172256646 in words is "one hundred seventy-two million, two hundred fifty-six thousand, six hundred forty-six".