66486730 has 32 divisors (see below), whose sum is σ = 121801680. Its totient is φ = 26127360.

The previous prime is 66486727. The next prime is 66486731. The reversal of 66486730 is 3768466.

It can be written as a sum of positive squares in 8 ways, for example, as 8071281 + 58415449 = 2841^2 + 7643^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66486731) 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, 197122 + ... + 197458.

Almost surely, 2^66486730 is an apocalyptic number.

66486730 is a deficient number, since it is larger than the sum of its proper divisors (55314950).

66486730 is a wasteful number, since it uses less digits than its factorization.

66486730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 66486730 is about 8153.9395386525. The cubic root of 66486730 is about 405.1150006197.

The spelling of 66486730 in words is "sixty-six million, four hundred eighty-six thousand, seven hundred thirty".