66682987 has 8 divisors (see below), whose sum is σ = 77283072. Its totient is φ = 56351400.

The previous prime is 66682961. The next prime is 66682997. The reversal of 66682987 is 78928666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66682987 - 2¹⁵ = 66650219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66682907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66589 + ... + 67582.

It is an arithmetic number, because the mean of its divisors is an integer number (9660384).

Almost surely, 2^66682987 is an apocalyptic number.

66682987 is a deficient number, since it is larger than the sum of its proper divisors (10600085).

66682987 is a wasteful number, since it uses less digits than its factorization.

66682987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134249.

The product of its digits is 1741824, while the sum is 52.

The square root of 66682987 is about 8165.9651603469. The cubic root of 66682987 is about 405.5132181932.

The spelling of 66682987 in words is "sixty-six million, six hundred eighty-two thousand, nine hundred eighty-seven".