90406666 has 12 divisors (see below), whose sum is σ = 157750578. Its totient is φ = 38745672.

The previous prime is 90406639. The next prime is 90406669. The reversal of 90406666 is 66660409.

It can be written as a sum of positive squares in only one way, i.e., 88906041 + 1500625 = 9429^2 + 1225^2 .

It is not an unprimeable number, because it can be changed into a prime (90406669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 461161 + ... + 461356.

Almost surely, 2^90406666 is an apocalyptic number.

90406666 is a deficient number, since it is larger than the sum of its proper divisors (67343912).

90406666 is a wasteful number, since it uses less digits than its factorization.

90406666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922533 (or 922526 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 90406666 is about 9508.2420036514. The cubic root of 90406666 is about 448.8144364761.

The spelling of 90406666 in words is "ninety million, four hundred six thousand, six hundred sixty-six".