66199290 has 64 divisors (see below), whose sum is σ = 170332416. Its totient is φ = 16422912.

The previous prime is 66199201. The next prime is 66199307. The reversal of 66199290 is 9299166.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24234 + ... + 26826.

It is an arithmetic number, because the mean of its divisors is an integer number (2661444).

Almost surely, 2^66199290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66199290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85166208).

66199290 is an abundant number, since it is smaller than the sum of its proper divisors (104133126).

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

66199290 is a wasteful number, since it uses less digits than its factorization.

66199290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 66199290 is about 8136.2946111851. The cubic root of 66199290 is about 404.5303502718.

The spelling of 66199290 in words is "sixty-six million, one hundred ninety-nine thousand, two hundred ninety".