66670000 has 100 divisors (see below), whose sum is σ = 165603240. Its totient is φ = 25984000.

The previous prime is 66669997. The next prime is 66670013. The reversal of 66670000 is 7666.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 589944 + ... + 590056.

Almost surely, 2^66670000 is an apocalyptic number.

66670000 is the 6667-th pentagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66670000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82801620).

66670000 is an abundant number, since it is smaller than the sum of its proper divisors (98933240).

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

66670000 is a wasteful number, since it uses less digits than its factorization.

66670000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 66670000 is about 8165.1699308710. The cubic root of 66670000 is about 405.4868909278.

Adding to 66670000 its reverse (7666), we get a palindrome (66677666).

The spelling of 66670000 in words is "sixty-six million, six hundred seventy thousand".