28707880357 has 8 divisors (see below), whose sum is σ = 31073116536. Its totient is φ = 26365063872.

The previous prime is 28707880351. The next prime is 28707880379. The reversal of 28707880357 is 75308870782.

It is a Cunningham number, because it is equal to 169434²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 4246607556 + 24461272801 = 65166^2 + 156401^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28707880357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28707880298 and 28707880307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28707880351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5602258 + ... + 5607379.

It is an arithmetic number, because the mean of its divisors is an integer number (3884139567).

Almost surely, 2^28707880357 is an apocalyptic number.

It is an amenable number.

28707880357 is a deficient number, since it is larger than the sum of its proper divisors (2365236179).

28707880357 is a wasteful number, since it uses less digits than its factorization.

28707880357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11209847.

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 28707880357 in words is "twenty-eight billion, seven hundred seven million, eight hundred eighty thousand, three hundred fifty-seven".