28702431689 has 8 divisors (see below), whose sum is σ = 29481053448. Its totient is φ = 27923961600.

The previous prime is 28702431677. The next prime is 28702431691. The reversal of 28702431689 is 98613420782.

It can be written as a sum of positive squares in 4 ways, for example, as 19311271225 + 9391160464 = 138965^2 + 96908^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28702431689 - 2¹⁶ = 28702366153 is a prime.

It is a super-2 number, since 2×28702431689² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28702431619) 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 7 ways as a sum of consecutive naturals, for example, 419489 + ... + 483089.

It is an arithmetic number, because the mean of its divisors is an integer number (3685131681).

Almost surely, 2^28702431689 is an apocalyptic number.

It is an amenable number.

28702431689 is a deficient number, since it is larger than the sum of its proper divisors (778621759).

28702431689 is a wasteful number, since it uses less digits than its factorization.

28702431689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75835.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 28702431689 in words is "twenty-eight billion, seven hundred two million, four hundred thirty-one thousand, six hundred eighty-nine".