66977480 has 16 divisors (see below), whose sum is σ = 150699420. Its totient is φ = 26790976.

The previous prime is 66977461. The next prime is 66977483. The reversal of 66977480 is 8477966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 60310756 + 6666724 = 7766^2 + 2582^2 .

It is not an unprimeable number, because it can be changed into a prime (66977483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837179 + ... + 837258.

Almost surely, 2^66977480 is an apocalyptic number.

It is an amenable number.

66977480 is an abundant number, since it is smaller than the sum of its proper divisors (83721940).

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

66977480 is a wasteful number, since it uses less digits than its factorization.

66977480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674448 (or 1674444 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 66977480 is about 8183.9770283158. The cubic root of 66977480 is about 406.1092994411.

The spelling of 66977480 in words is "sixty-six million, nine hundred seventy-seven thousand, four hundred eighty".