23078809 has 24 divisors (see below), whose sum is σ = 27471960. Its totient is φ = 19289088.

The previous prime is 23078791. The next prime is 23078813. The reversal of 23078809 is 90887032.

It can be written as a sum of positive squares in 12 ways, for example, as 11923209 + 11155600 = 3453^2 + 3340^2 .

It is not a de Polignac number, because 23078809 - 2¹¹ = 23076761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23078819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83179 + ... + 83455.

It is an arithmetic number, because the mean of its divisors is an integer number (1144665).

Almost surely, 2^23078809 is an apocalyptic number.

23078809 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

23078809 is a deficient number, since it is larger than the sum of its proper divisors (4393151).

23078809 is a wasteful number, since it uses less digits than its factorization.

23078809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 23078809 is about 4804.0409032397. The cubic root of 23078809 is about 284.7111426454.

The spelling of 23078809 in words is "twenty-three million, seventy-eight thousand, eight hundred nine".