23121288 has 80 divisors (see below), whose sum is σ = 66908160. Its totient is φ = 7452000.

The previous prime is 23121283. The next prime is 23121331. The reversal of 23121288 is 88212132.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121281) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19513 + ... + 20663.

It is an arithmetic number, because the mean of its divisors is an integer number (836352).

Almost surely, 2^23121288 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 23121288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33454080).

23121288 is an abundant number, since it is smaller than the sum of its proper divisors (43786872).

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

23121288 is a wasteful number, since it uses less digits than its factorization.

23121288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200 (or 1187 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 23121288 is about 4808.4600445465. The cubic root of 23121288 is about 284.8857159515.

It can be divided in two parts, 23121 and 288, that added together give a square (23409 = 153²).

The spelling of 23121288 in words is "twenty-three million, one hundred twenty-one thousand, two hundred eighty-eight".