23215500 has 288 divisors, whose sum is σ = 92671488. Its totient is φ = 4752000.

The previous prime is 23215481. The next prime is 23215501. The reversal of 23215500 is 551232.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23215501) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 346467 + ... + 346533.

It is an arithmetic number, because the mean of its divisors is an integer number (321776).

Almost surely, 2^23215500 is an apocalyptic number.

23215500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46335744).

23215500 is an abundant number, since it is smaller than the sum of its proper divisors (69455988).

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

23215500 is a wasteful number, since it uses less digits than its factorization.

23215500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 23215500 is about 4818.2465690332. The cubic root of 23215500 is about 285.2721315782.

Adding to 23215500 its reverse (551232), we get a palindrome (23766732).

The spelling of 23215500 in words is "twenty-three million, two hundred fifteen thousand, five hundred".