90043661 has 8 divisors (see below), whose sum is σ = 92419704. Its totient is φ = 87692800.

The previous prime is 90043619. The next prime is 90043669. The reversal of 90043661 is 16634009.

It can be written as a sum of positive squares in 4 ways, for example, as 19802500 + 70241161 = 4450^2 + 8381^2 .

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 90043661 - 2²⁶ = 22934797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90043669) 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, 1061 + ... + 13461.

It is an arithmetic number, because the mean of its divisors is an integer number (11552463).

Almost surely, 2^90043661 is an apocalyptic number.

It is an amenable number.

90043661 is a deficient number, since it is larger than the sum of its proper divisors (2376043).

90043661 is a wasteful number, since it uses less digits than its factorization.

90043661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12591.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 90043661 is about 9489.1338382383. The cubic root of 90043661 is about 448.2129305746.

The spelling of 90043661 in words is "ninety million, forty-three thousand, six hundred sixty-one".