28769155491 has 8 divisors (see below), whose sum is σ = 39395600464. Its totient is φ = 18661073760.

The previous prime is 28769155487. The next prime is 28769155517. The reversal of 28769155491 is 19455196782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28769155491 - 2² = 28769155487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28769155421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129590680 + ... + 129590901.

It is an arithmetic number, because the mean of its divisors is an integer number (4924450058).

Almost surely, 2^28769155491 is an apocalyptic number.

28769155491 is a deficient number, since it is larger than the sum of its proper divisors (10626444973).

28769155491 is a wasteful number, since it uses less digits than its factorization.

28769155491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259181621.

The product of its digits is 5443200, while the sum is 57.

The spelling of 28769155491 in words is "twenty-eight billion, seven hundred sixty-nine million, one hundred fifty-five thousand, four hundred ninety-one".