90024509 has 4 divisors (see below), whose sum is σ = 90058080. Its totient is φ = 89990940.

The previous prime is 90024463. The next prime is 90024511. The reversal of 90024509 is 90542009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90542009 = 107 ⋅846187.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90024509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90024569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12377 + ... + 18254.

It is an arithmetic number, because the mean of its divisors is an integer number (22514520).

Almost surely, 2^90024509 is an apocalyptic number.

It is an amenable number.

90024509 is a deficient number, since it is larger than the sum of its proper divisors (33571).

90024509 is a wasteful number, since it uses less digits than its factorization.

90024509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33570.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 90024509 is about 9488.1246302944. The cubic root of 90024509 is about 448.1811505003.

The spelling of 90024509 in words is "ninety million, twenty-four thousand, five hundred nine".