28775317481 has 4 divisors (see below), whose sum is σ = 29001894912. Its totient is φ = 28548740052.

The previous prime is 28775317423. The next prime is 28775317499. The reversal of 28775317481 is 18471357782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28775317481 - 2³⁴ = 11595448297 is a prime.

It is a super-2 number, since 2×28775317481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28775317981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113288525 + ... + 113288778.

It is an arithmetic number, because the mean of its divisors is an integer number (7250473728).

Almost surely, 2^28775317481 is an apocalyptic number.

It is an amenable number.

28775317481 is a deficient number, since it is larger than the sum of its proper divisors (226577431).

28775317481 is a wasteful number, since it uses less digits than its factorization.

28775317481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226577430.

The product of its digits is 2634240, while the sum is 53.

The spelling of 28775317481 in words is "twenty-eight billion, seven hundred seventy-five million, three hundred seventeen thousand, four hundred eighty-one".