1999268064 has 144 divisors (see below), whose sum is σ = 5866372512. Its totient is φ = 645387264.

The previous prime is 1999268059. The next prime is 1999268069. The reversal of 1999268064 is 4608629991.

It is an interprime number because it is at equal distance from previous prime (1999268059) and next prime (1999268069).

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 1999268064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999268069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3974437 + ... + 3974939.

It is an arithmetic number, because the mean of its divisors is an integer number (40738698).

Almost surely, 2^1999268064 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 1999268064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2933186256).

1999268064 is an abundant number, since it is smaller than the sum of its proper divisors (3867104448).

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

1999268064 is a wasteful number, since it uses less digits than its factorization.

1999268064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 1999268064 is about 44713.1755078970. The cubic root of 1999268064 is about 1259.7673342127.

The spelling of 1999268064 in words is "one billion, nine hundred ninety-nine million, two hundred sixty-eight thousand, sixty-four".