19781475360 has 96 divisors (see below), whose sum is σ = 64460370240. Its totient is φ = 5093157888.

The previous prime is 19781475313. The next prime is 19781475361. The reversal of 19781475360 is 6357418791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (19781475361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696622 + ... + 724461.

It is an arithmetic number, because the mean of its divisors is an integer number (671462190).

Almost surely, 2^19781475360 is an apocalyptic number.

19781475360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19781475360 is an abundant number, since it is smaller than the sum of its proper divisors (44678894880).

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

19781475360 is a wasteful number, since it uses less digits than its factorization.

19781475360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421130 (or 1421122 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 51.

The spelling of 19781475360 in words is "nineteen billion, seven hundred eighty-one million, four hundred seventy-five thousand, three hundred sixty".