66987800 has 48 divisors (see below), whose sum is σ = 169911000. Its totient is φ = 24358400.

The previous prime is 66987779. The next prime is 66987829. The reversal of 66987800 is 878966.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13025 + ... + 17424.

Almost surely, 2^66987800 is an apocalyptic number.

It is an amenable number.

66987800 is an abundant number, since it is smaller than the sum of its proper divisors (102923200).

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

66987800 is a wasteful number, since it uses less digits than its factorization.

66987800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30476 (or 30467 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 66987800 is about 8184.6075043340. The cubic root of 66987800 is about 406.1301563656.

The spelling of 66987800 in words is "sixty-six million, nine hundred eighty-seven thousand, eight hundred".