19489397760 has 1056 divisors, whose sum is σ = 83874465792. Its totient is φ = 4087480320.

The previous prime is 19489397749. The next prime is 19489397761. The reversal of 19489397760 is 6779398491.

19489397760 is a `hidden beast` number, since 1 + 9 + 489 + 3 + 97 + 7 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19489397761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 274498525 + ... + 274498595.

Almost surely, 2^19489397760 is an apocalyptic number.

19489397760 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 19489397760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41937232896).

19489397760 is an abundant number, since it is smaller than the sum of its proper divisors (64385068032).

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

19489397760 is a wasteful number, since it uses less digits than its factorization.

19489397760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 63.

The spelling of 19489397760 in words is "nineteen billion, four hundred eighty-nine million, three hundred ninety-seven thousand, seven hundred sixty".