19783495680 has 832 divisors, whose sum is σ = 76092162048. Its totient is φ = 4341104640.

The previous prime is 19783495651. The next prime is 19783495691. The reversal of 19783495680 is 8659438791.

It is a tau number, because it is divible by the number of its divisors (832).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 420925417 + ... + 420925463.

Almost surely, 2^19783495680 is an apocalyptic number.

19783495680 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 19783495680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38046081024).

19783495680 is an abundant number, since it is smaller than the sum of its proper divisors (56308666368).

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

19783495680 is a wasteful number, since it uses less digits than its factorization.

19783495680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 19783495680 in words is "nineteen billion, seven hundred eighty-three million, four hundred ninety-five thousand, six hundred eighty".