648172 has 18 divisors (see below), whose sum is σ = 1319892. Its totient is φ = 277704.

The previous prime is 648133. The next prime is 648173. The reversal of 648172 is 271846.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 648172.

It is not an unprimeable number, because it can be changed into a prime (648173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1458 + ... + 1849.

2⁶⁴⁸¹⁷² is an apocalyptic number.

It is an amenable number.

648172 is an abundant number, since it is smaller than the sum of its proper divisors (671720).

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

648172 is a wasteful number, since it uses less digits than its factorization.

648172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325 (or 3316 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 648172 is about 805.0912991705. The cubic root of 648172 is about 86.5426299277.

It can be divided in two parts, 648 and 172, that added together give a triangular number (820 = T₄₀).

The spelling of 648172 in words is "six hundred forty-eight thousand, one hundred seventy-two".