66632880 has 40 divisors (see below), whose sum is σ = 206562672. Its totient is φ = 17768704.

The previous prime is 66632873. The next prime is 66632897. The reversal of 66632880 is 8823666.

It is a tau number, because it is divible by the number of its divisors (40).

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, 138579 + ... + 139058.

Almost surely, 2^66632880 is an apocalyptic number.

66632880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66632880 is an abundant number, since it is smaller than the sum of its proper divisors (139929792).

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

66632880 is a wasteful number, since it uses less digits than its factorization.

66632880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277653 (or 277647 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 66632880 is about 8162.8965447321. The cubic root of 66632880 is about 405.4116223527.

The spelling of 66632880 in words is "sixty-six million, six hundred thirty-two thousand, eight hundred eighty".