222785640 has 640 divisors, whose sum is σ = 1003622400. Its totient is φ = 42923520.

The previous prime is 222785639. The next prime is 222785671. The reversal of 222785640 is 46587222.

222785640 is a `hidden beast` number, since 2 + 2 + 2 + 7 + 8 + 5 + 640 = 666.

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 = 222785595 and 222785604.

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 159 ways as a sum of consecutive naturals, for example, 4740097 + ... + 4740143.

It is an arithmetic number, because the mean of its divisors is an integer number (1568160).

Almost surely, 2^222785640 is an apocalyptic number.

222785640 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 222785640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (501811200).

222785640 is an abundant number, since it is smaller than the sum of its proper divisors (780836760).

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

222785640 is a wasteful number, since it uses less digits than its factorization.

222785640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 222785640 is about 14926.0054937683. The cubic root of 222785640 is about 606.2183312894.

The spelling of 222785640 in words is "two hundred twenty-two million, seven hundred eighty-five thousand, six hundred forty".