28799505561 has 8 divisors (see below), whose sum is σ = 38419547904. Its totient is φ = 19189566800.

The previous prime is 28799505533. The next prime is 28799505583. The reversal of 28799505561 is 16550599782.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28799505561 - 2¹⁹ = 28798981273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28799505661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2519241 + ... + 2530646.

It is an arithmetic number, because the mean of its divisors is an integer number (4802443488).

Almost surely, 2^28799505561 is an apocalyptic number.

It is an amenable number.

28799505561 is a deficient number, since it is larger than the sum of its proper divisors (9620042343).

28799505561 is a wasteful number, since it uses less digits than its factorization.

28799505561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5051791.

The product of its (nonzero) digits is 6804000, while the sum is 57.

The spelling of 28799505561 in words is "twenty-eight billion, seven hundred ninety-nine million, five hundred five thousand, five hundred sixty-one".