66000290 has 16 divisors (see below), whose sum is σ = 125789112. Its totient is φ = 24847104.

The previous prime is 66000287. The next prime is 66000299. The reversal of 66000290 is 9200066.

It can be written as a sum of positive squares in 4 ways, for example, as 52258441 + 13741849 = 7229^2 + 3707^2 .

It is not an unprimeable number, because it can be changed into a prime (66000299) 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, 193949 + ... + 194288.

Almost surely, 2^66000290 is an apocalyptic number.

66000290 is a deficient number, since it is larger than the sum of its proper divisors (59788822).

66000290 is a wasteful number, since it uses less digits than its factorization.

66000290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388261.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 66000290 is about 8124.0562528825. The cubic root of 66000290 is about 404.1245939601.

The spelling of 66000290 in words is "sixty-six million, two hundred ninety", and thus it is an aban number.