66278508 has 24 divisors (see below), whose sum is σ = 154994112. Its totient is φ = 22043664.

The previous prime is 66278491. The next prime is 66278539. The reversal of 66278508 is 80587266.

It is a self number, because there is not a number n which added to its sum of digits gives 66278508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310 + ... + 11517.

It is an arithmetic number, because the mean of its divisors is an integer number (6458088).

Almost surely, 2^66278508 is an apocalyptic number.

It is an amenable number.

66278508 is an abundant number, since it is smaller than the sum of its proper divisors (88715604).

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

66278508 is a wasteful number, since it uses less digits than its factorization.

66278508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12301 (or 12299 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 66278508 is about 8141.1613422165. The cubic root of 66278508 is about 404.6916476262.

The spelling of 66278508 in words is "sixty-six million, two hundred seventy-eight thousand, five hundred eight".