19642397760 has 84 divisors (see below), whose sum is σ = 67561673868. Its totient is φ = 5237971968.

The previous prime is 19642397743. The next prime is 19642397783. The reversal of 19642397760 is 6779324691.

It is a happy number.

19642397760 is a `hidden beast` number, since 1 + 96 + 423 + 9 + 77 + 60 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5857759296 + 13784638464 = 76536^2 + 117408^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19642397697 and 19642397706.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3407259 + ... + 3413018.

Almost surely, 2^19642397760 is an apocalyptic number.

19642397760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19642397760 is an abundant number, since it is smaller than the sum of its proper divisors (47919276108).

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

19642397760 is a wasteful number, since it uses less digits than its factorization.

19642397760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6820300 (or 6820287 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 19642397760 in words is "nineteen billion, six hundred forty-two million, three hundred ninety-seven thousand, seven hundred sixty".