1639968960 has 112 divisors (see below), whose sum is σ = 5950768896. Its totient is φ = 374848512.

The previous prime is 1639968943. The next prime is 1639968961. The reversal of 1639968960 is 698699361.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 1639968960.

It is not an unprimeable number, because it can be changed into a prime (1639968961) 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, 115302 + ... + 128741.

Almost surely, 2^1639968960 is an apocalyptic number.

1639968960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1639968960 is an abundant number, since it is smaller than the sum of its proper divisors (4310799936).

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

1639968960 is a wasteful number, since it uses less digits than its factorization.

1639968960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244070 (or 244060 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 57.

The square root of 1639968960 is about 40496.5302217363. The cubic root of 1639968960 is about 1179.2662679764.

The spelling of 1639968960 in words is "one billion, six hundred thirty-nine million, nine hundred sixty-eight thousand, nine hundred sixty".