66609000 has 128 divisors (see below), whose sum is σ = 231004800. Its totient is φ = 17755200.

The previous prime is 66608999. The next prime is 66609017. The reversal of 66609000 is 90666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25767 + ... + 28233.

It is an arithmetic number, because the mean of its divisors is an integer number (1804725).

Almost surely, 2^66609000 is an apocalyptic number.

66609000 is a gapful number since it is divisible by the number (60) 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 66609000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115502400).

66609000 is an abundant number, since it is smaller than the sum of its proper divisors (164395800).

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

66609000 is a wasteful number, since it uses less digits than its factorization.

66609000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497 (or 2477 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 66609000 is about 8161.4336975803. The cubic root of 66609000 is about 405.3631858736.

Adding to 66609000 its reverse (90666), we get a palindrome (66699666).

The spelling of 66609000 in words is "sixty-six million, six hundred nine thousand".