28013091347521 has 16 divisors (see below), whose sum is σ = 32108283518976. Its totient is φ = 23941328611536.

The previous prime is 28013091347491. The next prime is 28013091347569. The reversal of 28013091347521 is 12574319031082.

It is not a de Polignac number, because 28013091347521 - 2³³ = 28004501412929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28013091317521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 723681 + ... + 7519966.

It is an arithmetic number, because the mean of its divisors is an integer number (2006767719936).

Almost surely, 2^{28013091347521} is an apocalyptic number.

It is an amenable number.

28013091347521 is a deficient number, since it is larger than the sum of its proper divisors (4095192171455).

28013091347521 is an equidigital number, since it uses as much as digits as its factorization.

28013091347521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8245068.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 28013091347521 in words is "twenty-eight trillion, thirteen billion, ninety-one million, three hundred forty-seven thousand, five hundred twenty-one".