28261753921 has 8 divisors (see below), whose sum is σ = 30189028104. Its totient is φ = 26363904000.

The previous prime is 28261753837. The next prime is 28261753957. The reversal of 28261753921 is 12935716282.

It can be written as a sum of positive squares in 4 ways, for example, as 2754150400 + 25507603521 = 52480^2 + 159711^2 .

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 28261753921 - 2¹¹ = 28261751873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28261753991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7354080 + ... + 7357921.

It is an arithmetic number, because the mean of its divisors is an integer number (3773628513).

Almost surely, 2^28261753921 is an apocalyptic number.

It is an amenable number.

28261753921 is a deficient number, since it is larger than the sum of its proper divisors (1927274183).

28261753921 is a wasteful number, since it uses less digits than its factorization.

28261753921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14712131.

The product of its digits is 362880, while the sum is 46.

The spelling of 28261753921 in words is "twenty-eight billion, two hundred sixty-one million, seven hundred fifty-three thousand, nine hundred twenty-one".