66898680 has 32 divisors (see below), whose sum is σ = 200696400. Its totient is φ = 17839616.

The previous prime is 66898661. The next prime is 66898691. The reversal of 66898680 is 8689866.

It is a congruent number.

It is an unprimeable number.

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, 278625 + ... + 278864.

Almost surely, 2^66898680 is an apocalyptic number.

66898680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66898680 is an abundant number, since it is smaller than the sum of its proper divisors (133797720).

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

66898680 is a wasteful number, since it uses less digits than its factorization.

66898680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557503 (or 557499 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The square root of 66898680 is about 8179.1613261996. The cubic root of 66898680 is about 405.9499724004.

The spelling of 66898680 in words is "sixty-six million, eight hundred ninety-eight thousand, six hundred eighty".