22587840 has 336 divisors, whose sum is σ = 91293696. Its totient is φ = 5068800.

The previous prime is 22587793. The next prime is 22587841. The reversal of 22587840 is 4878522.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22587795 and 22587804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22587841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 728625 + ... + 728655.

It is a vampire number, since it can be written as 4278 ⋅ 5280 (with its own digits).

Almost surely, 2^22587840 is an apocalyptic number.

22587840 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 22587840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45646848).

22587840 is an abundant number, since it is smaller than the sum of its proper divisors (68705856).

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

22587840 is a wasteful number, since it uses less digits than its factorization.

22587840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 22587840 is about 4752.6666199093. Note that the first 4 decimals coincide. The cubic root of 22587840 is about 282.6777120798.

The spelling of 22587840 in words is "twenty-two million, five hundred eighty-seven thousand, eight hundred forty".