23217408 has 72 divisors (see below), whose sum is σ = 68678400. Its totient is φ = 7736832.

The previous prime is 23217391. The next prime is 23217409. The reversal of 23217408 is 80471232.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23217409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5233 + ... + 8591.

Almost surely, 2^23217408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23217408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34339200).

23217408 is an abundant number, since it is smaller than the sum of its proper divisors (45460992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23217408 is an equidigital number, since it uses as much as digits as its factorization.

23217408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384 (or 3364 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 23217408 is about 4818.4445623043. Note that the first 3 decimals coincide. The cubic root of 23217408 is about 285.2799465339.

The spelling of 23217408 in words is "twenty-three million, two hundred seventeen thousand, four hundred eight".