1999964268 has 18 divisors (see below), whose sum is σ = 5055465324. Its totient is φ = 666654744.

The previous prime is 1999964261. The next prime is 1999964273. The reversal of 1999964268 is 8624699991.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1999964261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27777246 + ... + 27777317.

Almost surely, 2^1999964268 is an apocalyptic number.

1999964268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1999964268 is an abundant number, since it is smaller than the sum of its proper divisors (3055501056).

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

1999964268 is a wasteful number, since it uses less digits than its factorization.

1999964268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55554573 (or 55554568 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 63.

The square root of 1999964268 is about 44720.9600523066. The cubic root of 1999964268 is about 1259.9135466004.

The spelling of 1999964268 in words is "one billion, nine hundred ninety-nine million, nine hundred sixty-four thousand, two hundred sixty-eight".