689401188 has 144 divisors (see below), whose sum is σ = 2098969600. Its totient is φ = 190512000.

The previous prime is 689401171. The next prime is 689401189. The reversal of 689401188 is 881104986.

689401188 is a `hidden beast` number, since 68 + 9 + 401 + 188 = 666.

689401188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×689401188² = 950547996031622688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (689401189) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 381888 + ... + 383688.

Almost surely, 2^689401188 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 689401188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1049484800).

689401188 is an abundant number, since it is smaller than the sum of its proper divisors (1409568412).

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

689401188 is a wasteful number, since it uses less digits than its factorization.

689401188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863 (or 1844 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 689401188 is about 26256.4504074713. The cubic root of 689401188 is about 883.3998933430.

The spelling of 689401188 in words is "six hundred eighty-nine million, four hundred one thousand, one hundred eighty-eight".