1640223232 has 40 divisors (see below), whose sum is σ = 3297038976. Its totient is φ = 815158272.

The previous prime is 1640223217. The next prime is 1640223239. The reversal of 1640223232 is 2323220461.

It is a junction number, because it is equal to n+sod(n) for n = 1640223197 and 1640223206.

It is not an unprimeable number, because it can be changed into a prime (1640223239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75913 + ... + 95095.

Almost surely, 2^1640223232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640223232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1648519488).

1640223232 is an abundant number, since it is smaller than the sum of its proper divisors (1656815744).

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

1640223232 is an equidigital number, since it uses as much as digits as its factorization.

1640223232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19368 (or 19352 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1640223232 is about 40499.6695295159. The cubic root of 1640223232 is about 1179.3272119951.

Adding to 1640223232 its reverse (2323220461), we get a palindrome (3963443693).

The spelling of 1640223232 in words is "one billion, six hundred forty million, two hundred twenty-three thousand, two hundred thirty-two".