66278830 has 16 divisors (see below), whose sum is σ = 121325040. Its totient is φ = 26061952.

The previous prime is 66278813. The next prime is 66278831. The reversal of 66278830 is 3887266.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66278831) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 55579 + ... + 56758.

It is an arithmetic number, because the mean of its divisors is an integer number (7582815).

Almost surely, 2^66278830 is an apocalyptic number.

66278830 is a deficient number, since it is larger than the sum of its proper divisors (55046210).

66278830 is a wasteful number, since it uses less digits than its factorization.

66278830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112403.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 66278830 is about 8141.1811182408. The cubic root of 66278830 is about 404.6923029945.

The spelling of 66278830 in words is "sixty-six million, two hundred seventy-eight thousand, eight hundred thirty".