66487893 has 8 divisors (see below), whose sum is σ = 88778400. Its totient is φ = 44261328.

The previous prime is 66487891. The next prime is 66487907. The reversal of 66487893 is 39878466.

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

It is not a de Polignac number, because 66487893 - 2¹ = 66487891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66487891) 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, 13503 + ... + 17756.

It is an arithmetic number, because the mean of its divisors is an integer number (11097300).

Almost surely, 2^66487893 is an apocalyptic number.

It is an amenable number.

66487893 is a deficient number, since it is larger than the sum of its proper divisors (22290507).

66487893 is a wasteful number, since it uses less digits than its factorization.

66487893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31971.

The product of its digits is 1741824, while the sum is 51.

The square root of 66487893 is about 8154.0108535616. The cubic root of 66487893 is about 405.1173627251.

It can be divided in two parts, 6648 and 7893, that added together give a palindrome (14541).

The spelling of 66487893 in words is "sixty-six million, four hundred eighty-seven thousand, eight hundred ninety-three".