28786557026 has 4 divisors (see below), whose sum is σ = 43179835542. Its totient is φ = 14393278512.

The previous prime is 28786557017. The next prime is 28786557043. The reversal of 28786557026 is 62075568782.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 28630332025 + 156225001 = 169205^2 + 12499^2 .

It is a super-2 number, since 2×28786557026² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7196639255 + ... + 7196639258.

Almost surely, 2^28786557026 is an apocalyptic number.

28786557026 is a deficient number, since it is larger than the sum of its proper divisors (14393278516).

28786557026 is a wasteful number, since it uses less digits than its factorization.

28786557026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14393278515.

The product of its (nonzero) digits is 11289600, while the sum is 56.

The spelling of 28786557026 in words is "twenty-eight billion, seven hundred eighty-six million, five hundred fifty-seven thousand, twenty-six".