17428378787 has 4 divisors (see below), whose sum is σ = 17428693416. Its totient is φ = 17428064160.

The previous prime is 17428378753. The next prime is 17428378811. The reversal of 17428378787 is 78787382471.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 17428378787 - 2³⁴ = 248509603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17428378727) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 49673 + ... + 193194.

It is an arithmetic number, because the mean of its divisors is an integer number (4357173354).

Almost surely, 2^17428378787 is an apocalyptic number.

17428378787 is a deficient number, since it is larger than the sum of its proper divisors (314629).

17428378787 is an equidigital number, since it uses as much as digits as its factorization.

17428378787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314628.

The product of its digits is 29503488, while the sum is 62.

The spelling of 17428378787 in words is "seventeen billion, four hundred twenty-eight million, three hundred seventy-eight thousand, seven hundred eighty-seven".