1640332800 has 360 divisors, whose sum is σ = 6085090440. Its totient is φ = 421478400.

The previous prime is 1640332789. The next prime is 1640332801. The reversal of 1640332800 is 82330461.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (360).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640332801) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 3340555 + ... + 3341045.

It is an arithmetic number, because the mean of its divisors is an integer number (16903029).

Almost surely, 2^1640332800 is an apocalyptic number.

1640332800 is a gapful number since it is divisible by the number (10) 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 1640332800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3042545220).

1640332800 is an abundant number, since it is smaller than the sum of its proper divisors (4444757640).

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

1640332800 is a wasteful number, since it uses less digits than its factorization.

1640332800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1640332800 is about 40501.0222093221. The cubic root of 1640332800 is about 1179.3534713571.

The spelling of 1640332800 in words is "one billion, six hundred forty million, three hundred thirty-two thousand, eight hundred".