166778872 has 48 divisors (see below), whose sum is σ = 343292040. Its totient is φ = 75500352.

The previous prime is 166778809. The next prime is 166778881. The reversal of 166778872 is 278877661.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1199779 + ... + 1199917.

Almost surely, 2^166778872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166778872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171646020).

166778872 is an abundant number, since it is smaller than the sum of its proper divisors (176513168).

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

166778872 is a wasteful number, since it uses less digits than its factorization.

166778872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 237 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 52.

The square root of 166778872 is about 12914.2894500627. The cubic root of 166778872 is about 550.4446783944. Note that the first 3 decimals are identical.

The spelling of 166778872 in words is "one hundred sixty-six million, seven hundred seventy-eight thousand, eight hundred seventy-two".