90013520 has 20 divisors (see below), whose sum is σ = 209281620. Its totient is φ = 36005376.

The previous prime is 90013519. The next prime is 90013537. The reversal of 90013520 is 2531009.

It can be written as a sum of positive squares in 2 ways, for example, as 26460736 + 63552784 = 5144^2 + 7972^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 90013492 and 90013501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562505 + ... + 562664.

It is an arithmetic number, because the mean of its divisors is an integer number (10464081).

Almost surely, 2^90013520 is an apocalyptic number.

It is an amenable number.

90013520 is an abundant number, since it is smaller than the sum of its proper divisors (119268100).

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

90013520 is a wasteful number, since it uses less digits than its factorization.

90013520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125182 (or 1125176 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 90013520 is about 9487.5455203124. The cubic root of 90013520 is about 448.1629137515.

Adding to 90013520 its reverse (2531009), we get a palindrome (92544529).

It can be divided in two parts, 9001 and 3520, that added together give a palindrome (12521).

The spelling of 90013520 in words is "ninety million, thirteen thousand, five hundred twenty".