66830728 has 16 divisors (see below), whose sum is σ = 126060480. Its totient is φ = 33214608.

The previous prime is 66830719. The next prime is 66830747. The reversal of 66830728 is 82703866.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23676 + ... + 26347.

It is an arithmetic number, because the mean of its divisors is an integer number (7878780).

Almost surely, 2^66830728 is an apocalyptic number.

It is an amenable number.

66830728 is a deficient number, since it is larger than the sum of its proper divisors (59229752).

66830728 is a wasteful number, since it uses less digits than its factorization.

66830728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50196 (or 50192 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 66830728 is about 8175.0062996918. The cubic root of 66830728 is about 405.8124786182.

The spelling of 66830728 in words is "sixty-six million, eight hundred thirty thousand, seven hundred twenty-eight".