90040805 has 4 divisors (see below), whose sum is σ = 108048972. Its totient is φ = 72032640.

The previous prime is 90040777. The next prime is 90040813. The reversal of 90040805 is 50804009.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30658369 + 59382436 = 5537^2 + 7706^2 .

It is not a de Polignac number, because 90040805 - 2¹⁴ = 90024421 is a prime.

It is a super-3 number, since 3×90040805³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9004076 + ... + 9004085.

It is an arithmetic number, because the mean of its divisors is an integer number (27012243).

Almost surely, 2^90040805 is an apocalyptic number.

It is an amenable number.

90040805 is a deficient number, since it is larger than the sum of its proper divisors (18008167).

90040805 is a wasteful number, since it uses less digits than its factorization.

90040805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18008166.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 90040805 is about 9488.9833491265. The cubic root of 90040805 is about 448.2081917266.

The spelling of 90040805 in words is "ninety million, forty thousand, eight hundred five".