90212666 has 8 divisors (see below), whose sum is σ = 139684224. Its totient is φ = 43651260.

The previous prime is 90212657. The next prime is 90212677. The reversal of 90212666 is 66621209.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727460 + ... + 727583.

It is an arithmetic number, because the mean of its divisors is an integer number (17460528).

Almost surely, 2^90212666 is an apocalyptic number.

90212666 is a deficient number, since it is larger than the sum of its proper divisors (49471558).

90212666 is a wasteful number, since it uses less digits than its factorization.

90212666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455076.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 90212666 is about 9498.0348493781. The cubic root of 90212666 is about 448.4931756706.

The spelling of 90212666 in words is "ninety million, two hundred twelve thousand, six hundred sixty-six".