1645224224 has 96 divisors (see below), whose sum is σ = 3884702976. Its totient is φ = 670602240.

The previous prime is 1645224223. The next prime is 1645224241. The reversal of 1645224224 is 4224225461.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (1645224223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1014134 + ... + 1015754.

It is an arithmetic number, because the mean of its divisors is an integer number (40465656).

Almost surely, 2^1645224224 is an apocalyptic number.

1645224224 is a gapful number since it is divisible by the number (14) 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 1645224224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1942351488).

1645224224 is an abundant number, since it is smaller than the sum of its proper divisors (2239478752).

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

1645224224 is a wasteful number, since it uses less digits than its factorization.

1645224224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858 (or 1850 counting only the distinct ones).

The product of its digits is 30720, while the sum is 32.

The square root of 1645224224 is about 40561.3636851623. The cubic root of 1645224224 is about 1180.5245738118.

Adding to 1645224224 its reverse (4224225461), we get a palindrome (5869449685).

The spelling of 1645224224 in words is "one billion, six hundred forty-five million, two hundred twenty-four thousand, two hundred twenty-four".