28297997851 has 2 divisors, whose sum is σ = 28297997852. Its totient is φ = 28297997850.

The previous prime is 28297997821. The next prime is 28297997869. The reversal of 28297997851 is 15879979282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28297997851 - 2¹⁵ = 28297965083 is a prime.

It is not a weakly prime, because it can be changed into another prime (28297997801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14148998925 + 14148998926.

It is an arithmetic number, because the mean of its divisors is an integer number (14148998926).

Almost surely, 2^28297997851 is an apocalyptic number.

28297997851 is a deficient number, since it is larger than the sum of its proper divisors (1).

28297997851 is an equidigital number, since it uses as much as digits as its factorization.

28297997851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45722880, while the sum is 67.

The spelling of 28297997851 in words is "twenty-eight billion, two hundred ninety-seven million, nine hundred ninety-seven thousand, eight hundred fifty-one".