66354378 has 16 divisors (see below), whose sum is σ = 137285280. Its totient is φ = 21355376.

The previous prime is 66354377. The next prime is 66354413. The reversal of 66354378 is 87345366.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66354377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190500 + ... + 190847.

It is an arithmetic number, because the mean of its divisors is an integer number (8580330).

Almost surely, 2^66354378 is an apocalyptic number.

66354378 is an abundant number, since it is smaller than the sum of its proper divisors (70930902).

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

66354378 is a wasteful number, since it uses less digits than its factorization.

66354378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381381.

The product of its digits is 362880, while the sum is 42.

The square root of 66354378 is about 8145.8196640977. The cubic root of 66354378 is about 404.8460076036.

The spelling of 66354378 in words is "sixty-six million, three hundred fifty-four thousand, three hundred seventy-eight".