19679028520 has 64 divisors (see below), whose sum is σ = 44963067600. Its totient is φ = 7750533120.

The previous prime is 19679028511. The next prime is 19679028529. The reversal of 19679028520 is 2582097691.

It is an interprime number because it is at equal distance from previous prime (19679028511) and next prime (19679028529).

It can be written as a sum of positive squares in 8 ways, for example, as 5335133764 + 14343894756 = 73042^2 + 119766^2 .

It is not an unprimeable number, because it can be changed into a prime (19679028529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 846492 + ... + 869428.

Almost surely, 2^19679028520 is an apocalyptic number.

19679028520 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 19679028520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22481533800).

19679028520 is an abundant number, since it is smaller than the sum of its proper divisors (25284039080).

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

19679028520 is a wasteful number, since it uses less digits than its factorization.

19679028520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23278 (or 23274 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 19679028520 in words is "nineteen billion, six hundred seventy-nine million, twenty-eight thousand, five hundred twenty".