90888809 has 4 divisors (see below), whose sum is σ = 99151440. Its totient is φ = 82626180.

The previous prime is 90888797. The next prime is 90888823.

90888809 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is not a de Polignac number, because 90888809 - 2²⁴ = 74111593 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 (90888829) 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, 4131299 + ... + 4131320.

It is an arithmetic number, because the mean of its divisors is an integer number (24787860).

Almost surely, 2^90888809 is an apocalyptic number.

It is an amenable number.

90888809 is a deficient number, since it is larger than the sum of its proper divisors (8262631).

90888809 is a wasteful number, since it uses less digits than its factorization.

90888809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8262630.

The product of its (nonzero) digits is 331776, while the sum is 50.

The square root of 90888809 is about 9533.5622408416. The cubic root of 90888809 is about 449.6108718369.

The spelling of 90888809 in words is "ninety million, eight hundred eighty-eight thousand, eight hundred nine".