28720841433 has 8 divisors (see below), whose sum is σ = 38325619200. Its totient is φ = 19131645648.

The previous prime is 28720841419. The next prime is 28720841441. The reversal of 28720841433 is 33414802782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28720841433 - 2⁴ = 28720841417 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28720848433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3891193 + ... + 3898566.

It is an arithmetic number, because the mean of its divisors is an integer number (4790702400).

Almost surely, 2^28720841433 is an apocalyptic number.

It is an amenable number.

28720841433 is a deficient number, since it is larger than the sum of its proper divisors (9604777767).

28720841433 is a wasteful number, since it uses less digits than its factorization.

28720841433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790991.

The product of its (nonzero) digits is 258048, while the sum is 42.

The spelling of 28720841433 in words is "twenty-eight billion, seven hundred twenty million, eight hundred forty-one thousand, four hundred thirty-three".