28013051641 has 27 divisors (see below), whose sum is σ = 30987251589. Its totient is φ = 25318545912.

The previous prime is 28013051617. The next prime is 28013051669. The reversal of 28013051641 is 14615031082.

The square root of 28013051641 is 167371.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-28013051641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28013001641) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 73140936 + ... + 73141318.

Almost surely, 2^28013051641 is an apocalyptic number.

28013051641 is the 167371-st square number.

28013051641 is the 83686-th centered octagonal number.

It is an amenable number.

28013051641 is a deficient number, since it is larger than the sum of its proper divisors (2974199948).

28013051641 is an frugal number, since it uses more digits than its factorization.

With its successor (28013051642) it forms an eRAP, since the sums of their prime factors are consecutive (850 and 851).

28013051641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 28013051641 in words is "twenty-eight billion, thirteen million, fifty-one thousand, six hundred forty-one".