28251818473821 has 8 divisors (see below), whose sum is σ = 38199641880384. Its totient is φ = 18569270358240.

The previous prime is 28251818473817. The next prime is 28251818473831. The reversal of 28251818473821 is 12837481815282.

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

It is not a de Polignac number, because 28251818473821 - 2² = 28251818473817 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28251818473831) 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, 66318822496 + ... + 66318822921.

It is an arithmetic number, because the mean of its divisors is an integer number (4774955235048).

Almost surely, 2^{28251818473821} is an apocalyptic number.

It is an amenable number.

28251818473821 is a deficient number, since it is larger than the sum of its proper divisors (9947823406563).

28251818473821 is a wasteful number, since it uses less digits than its factorization.

28251818473821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132637645491.

The product of its digits is 13762560, while the sum is 60.

The spelling of 28251818473821 in words is "twenty-eight trillion, two hundred fifty-one billion, eight hundred eighteen million, four hundred seventy-three thousand, eight hundred twenty-one".