1640441800 has 48 divisors (see below), whose sum is σ = 3821563440. Its totient is φ = 654880320.

The previous prime is 1640441791. The next prime is 1640441821. The reversal of 1640441800 is 81440461.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96759 + ... + 112441.

It is an arithmetic number, because the mean of its divisors is an integer number (79615905).

Almost surely, 2^1640441800 is an apocalyptic number.

1640441800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640441800 is an abundant number, since it is smaller than the sum of its proper divisors (2181121640).

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

1640441800 is a wasteful number, since it uses less digits than its factorization.

1640441800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16222 (or 16213 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 1640441800 is about 40502.3678320169. The cubic root of 1640441800 is about 1179.3795934304.

The spelling of 1640441800 in words is "one billion, six hundred forty million, four hundred forty-one thousand, eight hundred".