28897777501643 has 2 divisors, whose sum is σ = 28897777501644. Its totient is φ = 28897777501642.

The previous prime is 28897777501577. The next prime is 28897777501669. The reversal of 28897777501643 is 34610577779882.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28897777501643 - 2⁴⁰ = 27798265873867 is a prime.

It is not a weakly prime, because it can be changed into another prime (28897777501673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14448888750821 + 14448888750822.

It is an arithmetic number, because the mean of its divisors is an integer number (14448888750822).

It is a 1-persistent number, because it is pandigital, but 2⋅28897777501643 = 57795555003286 is not.

Almost surely, 2^{28897777501643} is an apocalyptic number.

28897777501643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28897777501643 is an equidigital number, since it uses as much as digits as its factorization.

28897777501643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995742720, while the sum is 74.

The spelling of 28897777501643 in words is "twenty-eight trillion, eight hundred ninety-seven billion, seven hundred seventy-seven million, five hundred one thousand, six hundred forty-three".