28977632791 has 4 divisors (see below), whose sum is σ = 29651531272. Its totient is φ = 28303734312.

The previous prime is 28977632779. The next prime is 28977632797. The reversal of 28977632791 is 19723677982.

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

It is a cyclic number.

It is not a de Polignac number, because 28977632791 - 2⁵ = 28977632759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28977632797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336949176 + ... + 336949261.

It is an arithmetic number, because the mean of its divisors is an integer number (7412882818).

Almost surely, 2^28977632791 is an apocalyptic number.

28977632791 is a deficient number, since it is larger than the sum of its proper divisors (673898481).

28977632791 is an equidigital number, since it uses as much as digits as its factorization.

28977632791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673898480.

The product of its digits is 16003008, while the sum is 61.

The spelling of 28977632791 in words is "twenty-eight billion, nine hundred seventy-seven million, six hundred thirty-two thousand, seven hundred ninety-one".