1599744640 has 128 divisors (see below), whose sum is σ = 4207230720. Its totient is φ = 577966080.

The previous prime is 1599744637. The next prime is 1599744647. The reversal of 1599744640 is 464479951.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (1599744647) 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, 388995 + ... + 393085.

It is an arithmetic number, because the mean of its divisors is an integer number (32868990).

Almost surely, 2^1599744640 is an apocalyptic number.

1599744640 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 1599744640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2103615360).

1599744640 is an abundant number, since it is smaller than the sum of its proper divisors (2607486080).

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

1599744640 is a wasteful number, since it uses less digits than its factorization.

1599744640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170 (or 4158 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 1599744640 is about 39996.8078726290. The cubic root of 1599744640 is about 1169.5448688771.

The spelling of 1599744640 in words is "one billion, five hundred ninety-nine million, seven hundred forty-four thousand, six hundred forty".