90578249 has 4 divisors (see below), whose sum is σ = 93500160. Its totient is φ = 87656340.

The previous prime is 90578231. The next prime is 90578251. The reversal of 90578249 is 94287509.

It is a happy number.

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: 94287509 = 2179 ⋅43271.

It is a cyclic number.

It is not a de Polignac number, because 90578249 - 2¹² = 90574153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90578269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460909 + ... + 1460970.

It is an arithmetic number, because the mean of its divisors is an integer number (23375040).

Almost surely, 2^90578249 is an apocalyptic number.

It is an amenable number.

90578249 is a deficient number, since it is larger than the sum of its proper divisors (2921911).

90578249 is a wasteful number, since it uses less digits than its factorization.

90578249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921910.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 90578249 is about 9517.2605827517. The cubic root of 90578249 is about 449.0981923232.

The spelling of 90578249 in words is "ninety million, five hundred seventy-eight thousand, two hundred forty-nine".