90449809 has 8 divisors (see below), whose sum is σ = 95967720. Its totient is φ = 84953856.

The previous prime is 90449797. The next prime is 90449837. The reversal of 90449809 is 90894409.

It can be written as a sum of positive squares in 4 ways, for example, as 66781584 + 23668225 = 8172^2 + 4865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90449809 - 2⁹ = 90449297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90449839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3427 + ... + 13879.

It is an arithmetic number, because the mean of its divisors is an integer number (11995965).

Almost surely, 2^90449809 is an apocalyptic number.

It is an amenable number.

90449809 is a deficient number, since it is larger than the sum of its proper divisors (5517911).

90449809 is a wasteful number, since it uses less digits than its factorization.

90449809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10979.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 90449809 is about 9510.5104489717. The cubic root of 90449809 is about 448.8858180928.

The spelling of 90449809 in words is "ninety million, four hundred forty-nine thousand, eight hundred nine".