1640441320 has 64 divisors (see below), whose sum is σ = 4271731200. Its totient is φ = 555310080.

The previous prime is 1640441303. The next prime is 1640441321. The reversal of 1640441320 is 231440461.

It is not an unprimeable number, because it can be changed into a prime (1640441321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14961 + ... + 59200.

It is an arithmetic number, because the mean of its divisors is an integer number (66745800).

Almost surely, 2^1640441320 is an apocalyptic number.

1640441320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640441320 is an abundant number, since it is smaller than the sum of its proper divisors (2631289880).

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

1640441320 is a wasteful number, since it uses less digits than its factorization.

1640441320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74258 (or 74254 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1640441320 is about 40502.3619064370. The cubic root of 1640441320 is about 1179.3794784000.

Adding to 1640441320 its reverse (231440461), we get a palindrome (1871881781).

The spelling of 1640441320 in words is "one billion, six hundred forty million, four hundred forty-one thousand, three hundred twenty".