90985040 has 20 divisors (see below), whose sum is σ = 211540404. Its totient is φ = 36393984.

The previous prime is 90985039. The next prime is 90985049. The reversal of 90985040 is 4058909.

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 73479184 = 4184^2 + 8572^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90985049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568577 + ... + 568736.

Almost surely, 2^90985040 is an apocalyptic number.

It is an amenable number.

90985040 is an abundant number, since it is smaller than the sum of its proper divisors (120555364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90985040 is a wasteful number, since it uses less digits than its factorization.

90985040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137326 (or 1137320 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 90985040 is about 9538.6078648826. The cubic root of 90985040 is about 449.7694951167.

The spelling of 90985040 in words is "ninety million, nine hundred eighty-five thousand, forty".