23780065 has 4 divisors (see below), whose sum is σ = 28536084. Its totient is φ = 19024048.

The previous prime is 23780063. The next prime is 23780083. The reversal of 23780065 is 56008732.

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 7595536 + 16184529 = 2756^2 + 4023^2 .

It is a cyclic number.

It is not a de Polignac number, because 23780065 - 2¹ = 23780063 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23780063) 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, 2378002 + ... + 2378011.

It is an arithmetic number, because the mean of its divisors is an integer number (7134021).

Almost surely, 2^23780065 is an apocalyptic number.

It is an amenable number.

23780065 is a deficient number, since it is larger than the sum of its proper divisors (4756019).

23780065 is an equidigital number, since it uses as much as digits as its factorization.

23780065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4756018.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 23780065 is about 4876.4808007415. The cubic root of 23780065 is about 287.5660944450.

Adding to 23780065 its reverse (56008732), we get a palindrome (79788797).

The spelling of 23780065 in words is "twenty-three million, seven hundred eighty thousand, sixty-five".