90636785 has 8 divisors (see below), whose sum is σ = 108819816. Its totient is φ = 72472320.

The previous prime is 90636781. The next prime is 90636797. The reversal of 90636785 is 58763609.

It can be written as a sum of positive squares in 4 ways, for example, as 40056241 + 50580544 = 6329^2 + 7112^2 .

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

It is not a de Polignac number, because 90636785 - 2² = 90636781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90636781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10745 + ... + 17225.

It is an arithmetic number, because the mean of its divisors is an integer number (13602477).

Almost surely, 2^90636785 is an apocalyptic number.

It is an amenable number.

90636785 is a deficient number, since it is larger than the sum of its proper divisors (18183031).

90636785 is a wasteful number, since it uses less digits than its factorization.

90636785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 90636785 is about 9520.3353407325. The cubic root of 90636785 is about 449.1949144066.

The spelling of 90636785 in words is "ninety million, six hundred thirty-six thousand, seven hundred eighty-five".