66649038 has 16 divisors (see below), whose sum is σ = 133522896. Its totient is φ = 22178880.

The previous prime is 66648983. The next prime is 66649043. The reversal of 66649038 is 83094666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5383 + ... + 12738.

It is an arithmetic number, because the mean of its divisors is an integer number (8345181).

Almost surely, 2^66649038 is an apocalyptic number.

66649038 is an abundant number, since it is smaller than the sum of its proper divisors (66873858).

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

66649038 is a wasteful number, since it uses less digits than its factorization.

66649038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18739.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 66649038 is about 8163.8862069483. The cubic root of 66649038 is about 405.4443895170. Note that the first 3 decimals are identical.

The spelling of 66649038 in words is "sixty-six million, six hundred forty-nine thousand, thirty-eight".