28443523357 has 4 divisors (see below), whose sum is σ = 28507730400. Its totient is φ = 28379316316.

The previous prime is 28443523337. The next prime is 28443523369. The reversal of 28443523357 is 75332534482.

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 28443523357 - 2³¹ = 26296039709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28443523307) 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, 32102857 + ... + 32103742.

It is an arithmetic number, because the mean of its divisors is an integer number (7126932600).

Almost surely, 2^28443523357 is an apocalyptic number.

It is an amenable number.

28443523357 is a deficient number, since it is larger than the sum of its proper divisors (64207043).

28443523357 is an equidigital number, since it uses as much as digits as its factorization.

28443523357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64207042.

The product of its digits is 2419200, while the sum is 46.

The spelling of 28443523357 in words is "twenty-eight billion, four hundred forty-three million, five hundred twenty-three thousand, three hundred fifty-seven".