23728217 has 12 divisors (see below), whose sum is σ = 24964884. Its totient is φ = 22538880.

The previous prime is 23728189. The next prime is 23728219. The reversal of 23728217 is 71282732.

It can be written as a sum of positive squares in 2 ways, for example, as 534361 + 23193856 = 731^2 + 4816^2 .

It is not a de Polignac number, because 23728217 - 2¹² = 23724121 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 (23728219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75653 + ... + 75965.

It is an arithmetic number, because the mean of its divisors is an integer number (2080407).

Almost surely, 2^23728217 is an apocalyptic number.

It is an amenable number.

23728217 is a deficient number, since it is larger than the sum of its proper divisors (1236667).

23728217 is an equidigital number, since it uses as much as digits as its factorization.

23728217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 397 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 23728217 is about 4871.1617710768. The cubic root of 23728217 is about 287.3569476103.

The spelling of 23728217 in words is "twenty-three million, seven hundred twenty-eight thousand, two hundred seventeen".