7870428399889 has 6 divisors (see below), whose sum is σ = 8650966753730. Its totient is φ = 7154934908880.

The previous prime is 7870428399781. The next prime is 7870428399893. The reversal of 7870428399889 is 9889938240787.

It can be written as a sum of positive squares in only one way, i.e., 4143598149889 + 3726830250000 = 2035583^2 + 1930500^2 .

It is not a de Polignac number, because 7870428399889 - 2²¹ = 7870426302737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7870428399989) 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 5 ways as a sum of consecutive naturals, for example, 32522431284 + ... + 32522431525.

Almost surely, 2^{7870428399889} is an apocalyptic number.

It is an amenable number.

7870428399889 is a deficient number, since it is larger than the sum of its proper divisors (780538353841).

7870428399889 is a wasteful number, since it uses less digits than its factorization.

7870428399889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65044862831 (or 65044862820 counting only the distinct ones).

The product of its (nonzero) digits is 3511517184, while the sum is 82.

The spelling of 7870428399889 in words is "seven trillion, eight hundred seventy billion, four hundred twenty-eight million, three hundred ninety-nine thousand, eight hundred eighty-nine".