28977632809 has 2 divisors, whose sum is σ = 28977632810. Its totient is φ = 28977632808.

The previous prime is 28977632797. The next prime is 28977632867. The reversal of 28977632809 is 90823677982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28166237584 + 811395225 = 167828^2 + 28485^2 .

It is a cyclic number.

It is not a de Polignac number, because 28977632809 - 2⁵ = 28977632777 is a prime.

It is not a weakly prime, because it can be changed into another prime (28977632899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14488816404 + 14488816405.

It is an arithmetic number, because the mean of its divisors is an integer number (14488816405).

Almost surely, 2^28977632809 is an apocalyptic number.

It is an amenable number.

28977632809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28977632809 is an equidigital number, since it uses as much as digits as its factorization.

28977632809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18289152, while the sum is 61.

The spelling of 28977632809 in words is "twenty-eight billion, nine hundred seventy-seven million, six hundred thirty-two thousand, eight hundred nine".