66888487 has 4 divisors (see below), whose sum is σ = 67415296. Its totient is φ = 66361680.

The previous prime is 66888457. The next prime is 66888511. The reversal of 66888487 is 78488866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66888487 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 (66888407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263214 + ... + 263467.

It is an arithmetic number, because the mean of its divisors is an integer number (16853824).

Almost surely, 2^66888487 is an apocalyptic number.

66888487 is a deficient number, since it is larger than the sum of its proper divisors (526809).

66888487 is a wasteful number, since it uses less digits than its factorization.

66888487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526808.

The product of its digits is 4128768, while the sum is 55.

The square root of 66888487 is about 8178.5381945675. The cubic root of 66888487 is about 405.9293538658.

The spelling of 66888487 in words is "sixty-six million, eight hundred eighty-eight thousand, four hundred eighty-seven".