90166409 has 8 divisors (see below), whose sum is σ = 92134152. Its totient is φ = 88208640.

The previous prime is 90166403. The next prime is 90166411. The reversal of 90166409 is 90466109.

It can be written as a sum of positive squares in 4 ways, for example, as 16687225 + 73479184 = 4085^2 + 8572^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 90166409 - 2¹² = 90162313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90166403) 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, 17489 + ... + 22049.

It is an arithmetic number, because the mean of its divisors is an integer number (11516769).

Almost surely, 2^90166409 is an apocalyptic number.

It is an amenable number.

90166409 is a deficient number, since it is larger than the sum of its proper divisors (1967743).

90166409 is a wasteful number, since it uses less digits than its factorization.

90166409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4987.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 90166409 is about 9495.5994544842. The cubic root of 90166409 is about 448.4165068515.

The spelling of 90166409 in words is "ninety million, one hundred sixty-six thousand, four hundred nine".