23288440 has 64 divisors (see below), whose sum is σ = 61839360. Its totient is φ = 7724160.

The previous prime is 23288423. The next prime is 23288459. The reversal of 23288440 is 4488232.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7339 + ... + 10021.

It is an arithmetic number, because the mean of its divisors is an integer number (966240).

Almost surely, 2^23288440 is an apocalyptic number.

23288440 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 23288440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30919680).

23288440 is an abundant number, since it is smaller than the sum of its proper divisors (38550920).

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

23288440 is a wasteful number, since it uses less digits than its factorization.

23288440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732 (or 2728 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 23288440 is about 4825.8097766074. The cubic root of 23288440 is about 285.5705815435.

The spelling of 23288440 in words is "twenty-three million, two hundred eighty-eight thousand, four hundred forty".