66886378 has 32 divisors (see below), whose sum is σ = 110899152. Its totient is φ = 30067200.

The previous prime is 66886363. The next prime is 66886387. The reversal of 66886378 is 87368866.

It can be written as a sum of positive squares in 8 ways, for example, as 2934369 + 63952009 = 1713^2 + 7997^2 .

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 15 ways as a sum of consecutive naturals, for example, 286950 + ... + 287182.

Almost surely, 2^66886378 is an apocalyptic number.

66886378 is a deficient number, since it is larger than the sum of its proper divisors (44012774).

66886378 is a wasteful number, since it uses less digits than its factorization.

66886378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490.

The product of its digits is 2322432, while the sum is 52.

The square root of 66886378 is about 8178.4092585294. The cubic root of 66886378 is about 405.9250874913.

The spelling of 66886378 in words is "sixty-six million, eight hundred eighty-six thousand, three hundred seventy-eight".