19240679640 has 256 divisors, whose sum is σ = 71250923520. Its totient is φ = 4047667200.

The previous prime is 19240679617. The next prime is 19240679657. The reversal of 19240679640 is 4697604291.

It is a happy number.

It is a super-2 number, since 2×19240679640² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19240679640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4005240 + ... + 4010040.

It is an arithmetic number, because the mean of its divisors is an integer number (278323920).

Almost surely, 2^19240679640 is an apocalyptic number.

19240679640 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 19240679640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35625461760).

19240679640 is an abundant number, since it is smaller than the sum of its proper divisors (52010243880).

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

19240679640 is a wasteful number, since it uses less digits than its factorization.

19240679640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5202 (or 5198 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 19240679640 in words is "nineteen billion, two hundred forty million, six hundred seventy-nine thousand, six hundred forty".