90888409 has 8 divisors (see below), whose sum is σ = 96587208. Its totient is φ = 85228800.

The previous prime is 90888401. The next prime is 90888437. The reversal of 90888409 is 90488809.

It can be written as a sum of positive squares in 4 ways, for example, as 13395600 + 77492809 = 3660^2 + 8803^2 .

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 90888409 - 2³ = 90888401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90888401) 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, 4942 + ... + 14359.

It is an arithmetic number, because the mean of its divisors is an integer number (12073401).

Almost surely, 2^90888409 is an apocalyptic number.

It is an amenable number.

90888409 is a deficient number, since it is larger than the sum of its proper divisors (5698799).

90888409 is a wasteful number, since it uses less digits than its factorization.

90888409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19595.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 90888409 is about 9533.5412623012. The cubic root of 90888409 is about 449.6102122595.

The spelling of 90888409 in words is "ninety million, eight hundred eighty-eight thousand, four hundred nine".