28025291313 has 12 divisors (see below), whose sum is σ = 40898307268. Its totient is φ = 18490913280.

The previous prime is 28025291311. The next prime is 28025291363. The reversal of 28025291313 is 31319252082.

28025291313 is a `hidden beast` number, since 2 + 8 + 0 + 252 + 91 + 313 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21254140944 + 6771150369 = 145788^2 + 82287^2 .

It is not a de Polignac number, because 28025291313 - 2¹ = 28025291311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28025291311) 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, 16050268 + ... + 16052013.

Almost surely, 2^28025291313 is an apocalyptic number.

It is an amenable number.

28025291313 is a deficient number, since it is larger than the sum of its proper divisors (12873015955).

28025291313 is a wasteful number, since it uses less digits than its factorization.

28025291313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32102384 (or 32102381 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 28025291313 in words is "twenty-eight billion, twenty-five million, two hundred ninety-one thousand, three hundred thirteen".