28432207720447 has 4 divisors (see below), whose sum is σ = 28602460461456. Its totient is φ = 28261954979440.

The previous prime is 28432207720429. The next prime is 28432207720457. The reversal of 28432207720447 is 74402770223482.

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

It is a cyclic number.

It is not a de Polignac number, because 28432207720447 - 2³⁵ = 28397847982079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28432207720394 and 28432207720403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28432207720457) 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, 85126370254 + ... + 85126370587.

It is an arithmetic number, because the mean of its divisors is an integer number (7150615115364).

Almost surely, 2^{28432207720447} is an apocalyptic number.

28432207720447 is a deficient number, since it is larger than the sum of its proper divisors (170252741009).

28432207720447 is a wasteful number, since it uses less digits than its factorization.

28432207720447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170252741008.

The product of its (nonzero) digits is 8429568, while the sum is 52.

The spelling of 28432207720447 in words is "twenty-eight trillion, four hundred thirty-two billion, two hundred seven million, seven hundred twenty thousand, four hundred forty-seven".