28100771361 has 12 divisors (see below), whose sum is σ = 43712311188. Its totient is φ = 17292782304.

The previous prime is 28100771353. The next prime is 28100771381. The reversal of 28100771361 is 16317700182.

It can be written as a sum of positive squares in 2 ways, for example, as 10136462400 + 17964308961 = 100680^2 + 134031^2 .

It is not a de Polignac number, because 28100771361 - 2³ = 28100771353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28100771381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120088650 + ... + 120088883.

It is an arithmetic number, because the mean of its divisors is an integer number (3642692599).

Almost surely, 2^28100771361 is an apocalyptic number.

It is an amenable number.

28100771361 is a deficient number, since it is larger than the sum of its proper divisors (15611539827).

28100771361 is a wasteful number, since it uses less digits than its factorization.

28100771361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240177552 (or 240177549 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The spelling of 28100771361 in words is "twenty-eight billion, one hundred million, seven hundred seventy-one thousand, three hundred sixty-one".