28785693427 has 2 divisors, whose sum is σ = 28785693428. Its totient is φ = 28785693426.

The previous prime is 28785693361. The next prime is 28785693437. The reversal of 28785693427 is 72439658782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28785693427 is a prime.

It is a super-2 number, since 2×28785693427² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28785693437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392846713 + 14392846714.

It is an arithmetic number, because the mean of its divisors is an integer number (14392846714).

Almost surely, 2^28785693427 is an apocalyptic number.

28785693427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28785693427 is an equidigital number, since it uses as much as digits as its factorization.

28785693427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40642560, while the sum is 61.

The spelling of 28785693427 in words is "twenty-eight billion, seven hundred eighty-five million, six hundred ninety-three thousand, four hundred twenty-seven".