19719050400 has 864 divisors, whose sum is σ = 85779509760. Its totient is φ = 4354560000.

The previous prime is 19719050357. The next prime is 19719050411. The reversal of 19719050400 is 405091791.

19719050400 is a `hidden beast` number, since 19 + 7 + 190 + 50 + 400 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 32810100 + ... + 32810700.

It is an arithmetic number, because the mean of its divisors is an integer number (99281840).

Almost surely, 2^19719050400 is an apocalyptic number.

19719050400 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 19719050400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42889754880).

19719050400 is an abundant number, since it is smaller than the sum of its proper divisors (66060459360).

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

19719050400 is a wasteful number, since it uses less digits than its factorization.

19719050400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The spelling of 19719050400 in words is "nineteen billion, seven hundred nineteen million, fifty thousand, four hundred".