169989768 has 96 divisors (see below), whose sum is σ = 498902040. Its totient is φ = 51978240.

The previous prime is 169989763. The next prime is 169989769. The reversal of 169989768 is 867989961.

It can be written as a sum of positive squares in 4 ways, for example, as 105637284 + 64352484 = 10278^2 + 8022^2 .

Its product of digits (11757312) is a multiple of the sum of its prime divisors (1152).

It is not an unprimeable number, because it can be changed into a prime (169989763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180178 + ... + 181118.

Almost surely, 2^169989768 is an apocalyptic number.

169989768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 169989768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249451020).

169989768 is an abundant number, since it is smaller than the sum of its proper divisors (328912272).

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

169989768 is a wasteful number, since it uses less digits than its factorization.

169989768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159 (or 1152 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 169989768 is about 13038.0124252127. The cubic root of 169989768 is about 553.9547113773.

The spelling of 169989768 in words is "one hundred sixty-nine million, nine hundred eighty-nine thousand, seven hundred sixty-eight".