23778145 has 4 divisors (see below), whose sum is σ = 28533780. Its totient is φ = 19022512.

The previous prime is 23778143. The next prime is 23778169. The reversal of 23778145 is 54187732.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12967201 + 10810944 = 3601^2 + 3288^2 .

It is a cyclic number.

It is not a de Polignac number, because 23778145 - 2¹ = 23778143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23778143) 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, 2377810 + ... + 2377819.

It is an arithmetic number, because the mean of its divisors is an integer number (7133445).

Almost surely, 2^23778145 is an apocalyptic number.

It is an amenable number.

23778145 is a deficient number, since it is larger than the sum of its proper divisors (4755635).

23778145 is an equidigital number, since it uses as much as digits as its factorization.

23778145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755634.

The product of its digits is 47040, while the sum is 37.

The square root of 23778145 is about 4876.2839334887. The cubic root of 23778145 is about 287.5583548844.

The spelling of 23778145 in words is "twenty-three million, seven hundred seventy-eight thousand, one hundred forty-five".