28054978561 has 8 divisors (see below), whose sum is σ = 29764090880. Its totient is φ = 26369119728.

The previous prime is 28054978559. The next prime is 28054978577. The reversal of 28054978561 is 16587945082.

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 28054978561 - 2¹ = 28054978559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28054978661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5810886 + ... + 5815711.

It is an arithmetic number, because the mean of its divisors is an integer number (3720511360).

Almost surely, 2^28054978561 is an apocalyptic number.

It is an amenable number.

28054978561 is a deficient number, since it is larger than the sum of its proper divisors (1709112319).

28054978561 is a wasteful number, since it uses less digits than its factorization.

28054978561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11626743.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 28054978561 in words is "twenty-eight billion, fifty-four million, nine hundred seventy-eight thousand, five hundred sixty-one".