66733390 has 32 divisors (see below), whose sum is σ = 126063360. Its totient is φ = 25401600.

The previous prime is 66733369. The next prime is 66733399. The reversal of 66733390 is 9333766.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66733399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17146 + ... + 20674.

It is an arithmetic number, because the mean of its divisors is an integer number (3939480).

Almost surely, 2^66733390 is an apocalyptic number.

66733390 is a deficient number, since it is larger than the sum of its proper divisors (59329970).

66733390 is a wasteful number, since it uses less digits than its factorization.

66733390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628.

The product of its (nonzero) digits is 61236, while the sum is 37.

The square root of 66733390 is about 8169.0507404471. The cubic root of 66733390 is about 405.6153628637.

The spelling of 66733390 in words is "sixty-six million, seven hundred thirty-three thousand, three hundred ninety".