66700378 has 8 divisors (see below), whose sum is σ = 100248660. Its totient is φ = 33284160.

The previous prime is 66700373. The next prime is 66700421. The reversal of 66700378 is 87300766.

It can be written as a sum of positive squares in 2 ways, for example, as 63888049 + 2812329 = 7993^2 + 1677^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66700373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31743 + ... + 33778.

Almost surely, 2^66700378 is an apocalyptic number.

66700378 is a deficient number, since it is larger than the sum of its proper divisors (33548282).

66700378 is a wasteful number, since it uses less digits than its factorization.

66700378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66032.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 66700378 is about 8167.0299374987. The cubic root of 66700378 is about 405.5484679008.

The spelling of 66700378 in words is "sixty-six million, seven hundred thousand, three hundred seventy-eight".