28809347940977 has 4 divisors (see below), whose sum is σ = 28821654371316. Its totient is φ = 28797041510640.

The previous prime is 28809347940953. The next prime is 28809347940983. The reversal of 28809347940977 is 77904974390882.

It is a happy number.

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 13073655294001 + 15735692646976 = 3615751^2 + 3966824^2 .

It is a cyclic number.

It is not a de Polignac number, because 28809347940977 - 2⁴⁴ = 11217161896561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28809347940898 and 28809347940907.

It is not an unprimeable number, because it can be changed into a prime (28809347940937) 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, 6153211658 + ... + 6153216339.

It is an arithmetic number, because the mean of its divisors is an integer number (7205413592829).

Almost surely, 2^{28809347940977} is an apocalyptic number.

It is an amenable number.

28809347940977 is a deficient number, since it is larger than the sum of its proper divisors (12306430339).

28809347940977 is a wasteful number, since it uses less digits than its factorization.

28809347940977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12306430338.

The product of its (nonzero) digits is 1536288768, while the sum is 77.

The spelling of 28809347940977 in words is "twenty-eight trillion, eight hundred nine billion, three hundred forty-seven million, nine hundred forty thousand, nine hundred seventy-seven".