28397935144457 has 4 divisors (see below), whose sum is σ = 29165446905156. Its totient is φ = 27630423383760.

The previous prime is 28397935144387. The next prime is 28397935144591. The reversal of 28397935144457 is 75444153979382.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25416732333001 + 2981202811456 = 5041501^2 + 1726616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28397935144457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28397934144457) 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 3 ways as a sum of consecutive naturals, for example, 383755880294 + ... + 383755880367.

It is an arithmetic number, because the mean of its divisors is an integer number (7291361726289).

Almost surely, 2^{28397935144457} is an apocalyptic number.

It is an amenable number.

28397935144457 is a deficient number, since it is larger than the sum of its proper divisors (767511760699).

28397935144457 is an equidigital number, since it uses as much as digits as its factorization.

28397935144457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767511760698.

The product of its digits is 914457600, while the sum is 71.

The spelling of 28397935144457 in words is "twenty-eight trillion, three hundred ninety-seven billion, nine hundred thirty-five million, one hundred forty-four thousand, four hundred fifty-seven".