90081305 has 8 divisors (see below), whose sum is σ = 110734344. Its totient is φ = 70307200.

The previous prime is 90081289. The next prime is 90081307. The reversal of 90081305 is 50318009.

It can be written as a sum of positive squares in 4 ways, for example, as 10995856 + 79085449 = 3316^2 + 8893^2 .

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

It is not a de Polignac number, because 90081305 - 2⁴ = 90081289 is a prime.

It is a super-2 number, since 2×90081305² = 16229283021006050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90081307) 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, 219506 + ... + 219915.

It is an arithmetic number, because the mean of its divisors is an integer number (13841793).

Almost surely, 2^90081305 is an apocalyptic number.

It is an amenable number.

90081305 is a deficient number, since it is larger than the sum of its proper divisors (20653039).

90081305 is a wasteful number, since it uses less digits than its factorization.

90081305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439467.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 90081305 is about 9491.1171629055. The cubic root of 90081305 is about 448.2753824143.

The spelling of 90081305 in words is "ninety million, eighty-one thousand, three hundred five".