28240935447 has 4 divisors (see below), whose sum is σ = 37654580600. Its totient is φ = 18827290296.

The previous prime is 28240935421. The next prime is 28240935493. The reversal of 28240935447 is 74453904282.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28240935447 - 2¹⁶ = 28240869911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28240935396 and 28240935405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28240935497) 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, 4706822572 + ... + 4706822577.

It is an arithmetic number, because the mean of its divisors is an integer number (9413645150).

Almost surely, 2^28240935447 is an apocalyptic number.

28240935447 is a deficient number, since it is larger than the sum of its proper divisors (9413645153).

28240935447 is an equidigital number, since it uses as much as digits as its factorization.

28240935447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9413645152.

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 28240935447 in words is "twenty-eight billion, two hundred forty million, nine hundred thirty-five thousand, four hundred forty-seven".