66708887 has 8 divisors (see below), whose sum is σ = 76419072. Its totient is φ = 57043800.

The previous prime is 66708883. The next prime is 66708911. The reversal of 66708887 is 78880766.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66708887 - 2² = 66708883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708883) 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, 8039 + ... + 14072.

It is an arithmetic number, because the mean of its divisors is an integer number (9552384).

Almost surely, 2^66708887 is an apocalyptic number.

66708887 is a deficient number, since it is larger than the sum of its proper divisors (9710185).

66708887 is a wasteful number, since it uses less digits than its factorization.

66708887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22549.

The product of its (nonzero) digits is 903168, while the sum is 50.

The square root of 66708887 is about 8167.5508568971. The cubic root of 66708887 is about 405.5657125067.

The spelling of 66708887 in words is "sixty-six million, seven hundred eight thousand, eight hundred eighty-seven".