66767487 has 4 divisors (see below), whose sum is σ = 89023320. Its totient is φ = 44511656.

The previous prime is 66767473. The next prime is 66767497. The reversal of 66767487 is 78476766.

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

It is a cyclic number.

It is not a de Polignac number, because 66767487 - 2⁴ = 66767471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66767417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11127912 + ... + 11127917.

It is an arithmetic number, because the mean of its divisors is an integer number (22255830).

Almost surely, 2^66767487 is an apocalyptic number.

66767487 is a deficient number, since it is larger than the sum of its proper divisors (22255833).

66767487 is a wasteful number, since it uses less digits than its factorization.

66767487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22255832.

The product of its digits is 2370816, while the sum is 51.

The square root of 66767487 is about 8171.1374361223. The cubic root of 66767487 is about 405.6844332956.

The spelling of 66767487 in words is "sixty-six million, seven hundred sixty-seven thousand, four hundred eighty-seven".