166872864 has 48 divisors (see below), whose sum is σ = 442985760. Its totient is φ = 54996480.

The previous prime is 166872821. The next prime is 166872869. The reversal of 166872864 is 468278661.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (166872869) 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, 1222 + ... + 18309.

It is an arithmetic number, because the mean of its divisors is an integer number (9228870).

Almost surely, 2^166872864 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 166872864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221492880).

166872864 is an abundant number, since it is smaller than the sum of its proper divisors (276112896).

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

166872864 is a wasteful number, since it uses less digits than its factorization.

166872864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19633 (or 19625 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 166872864 is about 12917.9280072309. The cubic root of 166872864 is about 550.5480641518.

The spelling of 166872864 in words is "one hundred sixty-six million, eight hundred seventy-two thousand, eight hundred sixty-four".