28920144961 has 8 divisors (see below), whose sum is σ = 30516618240. Its totient is φ = 27351928032.

The previous prime is 28920144947. The next prime is 28920144971. The reversal of 28920144961 is 16944102982.

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 28920144961 - 2¹³ = 28920136769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28920144971) 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, 7061985 + ... + 7066078.

It is an arithmetic number, because the mean of its divisors is an integer number (3814577280).

Almost surely, 2^28920144961 is an apocalyptic number.

It is an amenable number.

28920144961 is a deficient number, since it is larger than the sum of its proper divisors (1596473279).

28920144961 is a wasteful number, since it uses less digits than its factorization.

28920144961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14128175.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 28920144961 in words is "twenty-eight billion, nine hundred twenty million, one hundred forty-four thousand, nine hundred sixty-one".