90305645 has 8 divisors (see below), whose sum is σ = 109326456. Its totient is φ = 71604736.

The previous prime is 90305629. The next prime is 90305647. The reversal of 90305645 is 54650309.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11202409 + 79103236 = 3347^2 + 8894^2 .

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 90305645 - 2⁴ = 90305629 is a prime.

It is a super-3 number, since 3×90305645³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90305647) 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, 79352 + ... + 80481.

It is an arithmetic number, because the mean of its divisors is an integer number (13665807).

Almost surely, 2^90305645 is an apocalyptic number.

It is an amenable number.

90305645 is a deficient number, since it is larger than the sum of its proper divisors (19020811).

90305645 is a wasteful number, since it uses less digits than its factorization.

90305645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159951.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 90305645 is about 9502.9282329185. The cubic root of 90305645 is about 448.6472047762.

The spelling of 90305645 in words is "ninety million, three hundred five thousand, six hundred forty-five".