166439828 has 12 divisors (see below), whose sum is σ = 298374132. Its totient is φ = 81190080.

The previous prime is 166439821. The next prime is 166439849. The reversal of 166439828 is 828934661.

It can be written as a sum of positive squares in 2 ways, for example, as 22391824 + 144048004 = 4732^2 + 12002^2 .

It is a super-3 number, since 3×166439828³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166439821) 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, 507275 + ... + 507602.

It is an arithmetic number, because the mean of its divisors is an integer number (24864511).

Almost surely, 2^166439828 is an apocalyptic number.

It is an amenable number.

166439828 is a deficient number, since it is larger than the sum of its proper divisors (131934304).

166439828 is a wasteful number, since it uses less digits than its factorization.

166439828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014922 (or 1014920 counting only the distinct ones).

The product of its digits is 497664, while the sum is 47.

The square root of 166439828 is about 12901.1560722286. The cubic root of 166439828 is about 550.0714265364.

The spelling of 166439828 in words is "one hundred sixty-six million, four hundred thirty-nine thousand, eight hundred twenty-eight".