66084890 has 8 divisors (see below), whose sum is σ = 118952820. Its totient is φ = 26433952.

The previous prime is 66084859. The next prime is 66084913. The reversal of 66084890 is 9848066.

It can be written as a sum of positive squares in 2 ways, for example, as 65983129 + 101761 = 8123^2 + 319^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3304235 + ... + 3304254.

Almost surely, 2^66084890 is an apocalyptic number.

66084890 is a deficient number, since it is larger than the sum of its proper divisors (52867930).

66084890 is a wasteful number, since it uses less digits than its factorization.

66084890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6608496.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 66084890 is about 8129.2613440583. The cubic root of 66084890 is about 404.2971908942.

The spelling of 66084890 in words is "sixty-six million, eighty-four thousand, eight hundred ninety".