19728250797 has 24 divisors (see below), whose sum is σ = 28779141888. Its totient is φ = 11979173760.

The previous prime is 19728250757. The next prime is 19728250807. The reversal of 19728250797 is 79705282791.

It is not a de Polignac number, because 19728250797 - 2⁶ = 19728250733 is a prime.

It is a super-2 number, since 2×19728250797² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728250757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152253 + ... + 250274.

It is an arithmetic number, because the mean of its divisors is an integer number (1199130912).

Almost surely, 2^19728250797 is an apocalyptic number.

19728250797 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19728250797 is a deficient number, since it is larger than the sum of its proper divisors (9050891091).

19728250797 is a wasteful number, since it uses less digits than its factorization.

19728250797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402609 (or 402578 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 57.

The spelling of 19728250797 in words is "nineteen billion, seven hundred twenty-eight million, two hundred fifty thousand, seven hundred ninety-seven".