66738687 has 8 divisors (see below), whose sum is σ = 89032320. Its totient is φ = 44468760.

The previous prime is 66738677. The next prime is 66738689. The reversal of 66738687 is 78683766.

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

It is not a de Polignac number, because 66738687 - 2¹⁴ = 66722303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66738689) 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, 2262 + ... + 11772.

It is an arithmetic number, because the mean of its divisors is an integer number (11129040).

Almost surely, 2^66738687 is an apocalyptic number.

66738687 is a deficient number, since it is larger than the sum of its proper divisors (22293633).

66738687 is a wasteful number, since it uses less digits than its factorization.

66738687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11853.

The product of its digits is 2032128, while the sum is 51.

The square root of 66738687 is about 8169.3749454900. The cubic root of 66738687 is about 405.6260945616.

The spelling of 66738687 in words is "sixty-six million, seven hundred thirty-eight thousand, six hundred eighty-seven".