66816760 has 16 divisors (see below), whose sum is σ = 150337800. Its totient is φ = 26726688.

The previous prime is 66816731. The next prime is 66816767. The reversal of 66816760 is 6761866.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1670419 = 66816760 / (6 + 6 + 8 + 1 + 6 + 7 + 6 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66816767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835170 + ... + 835249.

Almost surely, 2^66816760 is an apocalyptic number.

It is an amenable number.

66816760 is an abundant number, since it is smaller than the sum of its proper divisors (83521040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66816760 is a wasteful number, since it uses less digits than its factorization.

66816760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670430 (or 1670426 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66816760 is about 8174.1519437799. The cubic root of 66816760 is about 405.7842042808.

It can be divided in two parts, 66816 and 760, that added together give a palindrome (67576).

The spelling of 66816760 in words is "sixty-six million, eight hundred sixteen thousand, seven hundred sixty".