22665000 has 80 divisors (see below), whose sum is σ = 70852320. Its totient is φ = 6040000.

The previous prime is 22664989. The next prime is 22665011. The reversal of 22665000 is 56622.

It is an interprime number because it is at equal distance from previous prime (22664989) and next prime (22665011).

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 19 ways as a sum of consecutive naturals, for example, 14245 + ... + 15755.

It is an arithmetic number, because the mean of its divisors is an integer number (885654).

Almost surely, 2^22665000 is an apocalyptic number.

22665000 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 22665000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35426160).

22665000 is an abundant number, since it is smaller than the sum of its proper divisors (48187320).

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

22665000 is a wasteful number, since it uses less digits than its factorization.

22665000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540 (or 1521 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 22665000 is about 4760.7772474671. Note that the first 3 decimals coincide. The cubic root of 22665000 is about 282.9992216971. Note that the first 3 decimals are identical.

The spelling of 22665000 in words is "twenty-two million, six hundred sixty-five thousand".